The old man was seen ________ in the park at 7∶00 a．m．yesterday．

A．exercise

B．exercised

C．to exercise

D．exercising

________ a host of the show is really ________．

A．Being, a hard work

B．To be, hard work

C．Being, work hard

D．To be, hard-working

It ________ over 10 years since my grandpa ________．

A．is, died

B．is, has been dead

C．has been, was dead

D．was, has died

The food in this shop ________ good and ________ very well．

A．tastes, sells

B．is tasted, is sold

C．tastes, is sold

D．is tasted, sells

When you feel helpless and ________ , just remember you are not ________ in the world because your friends are around you, including me．

A．alone; alone

B．lonely; lonely

C．alone; lonely

D．lonely; alone

It's two and a half weeks since the exchange students ________ Wuxi．

A．arrived

B．reached

C．have been in

D．have arrived in

Little Tom has got a lot of birthday presents, but he isn't able to take all of them ________．

A．on time

B．at a time

C．at same time

D．from time to time

We can have ________ bluer sky if we create ________ less polluted world．

A．a．a(chǎn)

B．a, the

C．the, a

D．the, the

We stopped ________, but heard nothing from the room．

A．to listening to

B．to listen to

C．listening

D．to listen

When you leave your classroom, you shouldn't ________ the lights ________．

A．leave…off

B．leave…on

C．turn…off

D．turn…on