5．We should take advantage of an opportunity as soon as it exists，               it goes away and does  not return．（　�。�

A．

even if

B．

as  if

C．

in that

D．

in case

4．The chapter of my life closed               I was financially dependent on my parents．（　�。�

A．

where

B．

when

C．

which

D．

what

3．While working in Kunming，he checked the weather each morning for months               he realized it would be the same every day．（　�。�

A．

when

B．

after

C．

before

D．

since

2．-I will be a vice president in a year or two．
-You can't be serious!       ．（　�。�

	A．	I can't make it		B．	I can't help it
	C．	I won't tell a soul		D．	I wouldn't bet on it

1．The problem        he will have his college education at home or abroad remains untouched．（　�。�

A．

how

B．

whether

C．

that

D．

when

20．When my mother became unwell，I felt a sense of duty that perhaps I ______ before．（　�。�

	A．	might not feel		B．	should not have felt
	C．	could not feel		D．	would not have felt

19．One of the common goals of most people nowadays is losing weight to achieve a healthier lifestyle．Many people weigh more than they should，taking into consideration their age，height，and other health factors．Obesity（肥胖） causes a lot of health risks and illnesses．Because of this，people should be more conscious of their health and choose a correct diet．
Dieting to lose weight is one aim that some people find hard to achieve．But with a lot of self-discipline and determination to lose weight，people are sure to realize that the hard work and sacrifices are well worth it，not to mention the various methods presented in the market．People have all the means to lose weight，given that they choose sensibly which method to use，and be wise enough to determine which one is false or not．
To effectively lose weight through dieting，here are some diet tips that are guaranteed to be effective and safe：
Eat less food than you normally consume before．You have to cut back on the amount of food that you eat to effectively lose weight．Instead of eating pizza and other high-calorie foods，consume healthier ones．You must always be careful about the amount of calories you take in when you eat food．You will weigh much less if you consume fewer calories．
Eat every four hours．Eating less food for every three to four hours all throughout the day will help you effectively lose weight and still keep your energy level at a maximum．Consume foods that are rich in fiber and protein．If you don't prefer eating small servings every four hours，have healthy snacks in between breakfast，lunch，and dinner．
Be healthy by consuming a lot of fruits and vegetables．Fruits and vegetables hold more than enough water and fiber to help you lose weight effectively．Aside from eating fruits and vegetables，you can also stop depriving yourself of the foods you love to eat，such as ice cream，pizza，and doughnuts．Have some of these favorite foods but never too much．
Perform daily workouts and get enough sleep．Exercise is an effective means of losing weight．You can either register for a fitness class in a nearby gym or buy exercise equipment that you can use at home anytime you want．You can lose all those unwanted fats and calories by exercising daily．And after your daily workouts，never forget to get some well-deserved rest and sleep．

Title	Lose weight effectively through these diet tips
Problem	Even with their age，height，and other health factors （71）considered，many people today are overweight．Quite a few of them want to solve the problem but find it not （72）easyto do so．
Effective and （73）safediet tips	（74）Reducethe amount of food that you eat．
	Consume foods that are healthier but contain （75）fewercalories．
	Eat small servings every three to four hours or have healthy snacks in （76）betweenbreakfast，lunch，and dinner．
	Have （77）lots/plentyof fruits and vegetables．
	Enjoy your favourite foods as usual only on （78）conditionthat you don't have too much．
	（79）Exerciseevery day and then make sure you have enough rest and sleep．
Conclusion	Obesity （80）contributes/leadsto a variety of health risks and illnesses．Therefore，follow the diet suggestions mentioned above and you will achieve a healthier lifestyle．

18．-I can't tolerate the air pollution here anymore．
-________!We've never had so many chemical factories before．（　�。�

A．

You said it

B．

Come off it

C．

You made it

D．

Cheer up

17．-Waiter!A cup of iced Cappuccino，please．I thirst for a cool coffee on such a hot day．
-________（　�。�

	A．	Why not？		B．	For here or to go？
	C．	My pleasure．		D．	Cheer up．

16．Ransomware is a type of malware that prevents users from accessing their system，either by locking the system's screen or by locking the users'files ________ a ransom is paid．（　　）

A．

if

B．

unless

C．

though

D．

when