—That's the third time he's won the award in this field．

—Yes．He ______ his maximum potential in the past decade．

A．explored                                                    B．is exploring

C．has been exploring                                    D．had explored

Any help from you will be greatly appreciated．Please give me a reply at your earliest ____．

A．interruption         B．instruction           C．consideration          D．convenience

—Will the match be cancelled because of the bad weather?

—No．Rain or shine, the match will be held as ______．

A．schedule        B．scheduling         C．scheduled          D．to schedule

It never occurred to humans until the mid-1990s _____ some animals can be cloned．

A．where         B．that          C．when            D．what

We're still at the airport．If it weren't for the delayed flight, we ______ the concert right now．

A．can be enjoying                                 B．must have enjoyed

C．would be enjoying                                 D．should have enjoyed

The beautiful sunset ______ our attention, and we stopped to watch it．

A．caught         B．paid           C．fixed          D．slipped

I am delighted _____ as chairman of the students' union last winter．

A．to appoint                                         B．to be appointed

C．to have appointed                                     D．to have been appointed

—Don't hesitate to buy the dress if you like the design and pattern．

—No, I won't, _____ the price is reasonable．

A．a(chǎn)s soon as          B．a(chǎn)s well as          C．a(chǎn)s far as               D．a(chǎn)s long as

The film Avatar will be on tonight but it's at 1:30am．I don't want to ______ that late．

A．stay up         B．show off          C．put up           D．get off

For environmental reasons, we ______ as well take these waste products and have them recycled．

A．should          B．would         C．might           D．could