---Did they have a good time at the party?
---Judging by their smiles, they _________ have enjoyed themselves.
| A．might | B．must | C．could | D．would |
Don’t worry. I’m sure you’ll succeed _______ if you work hard.
| A．on time | B．in time | C．at times | D．ahead of time |
The police spotted a thief________ things in a mall at this time yesterday.
| A．stealing | B．steal | C．robbed | D．picking |
In most western countries, on April Fool’s Day, people often play __ ___ trick on each other; children especially have great ______ fun.
| A．a; a | B．the; the | C．/; a | D．a; / |
－I’m thinking of the test tomorrow. I’m afraid I can’t pass this time.
－_________! I’m sure you’ll make it.
| A．Go ahead | B．Good luck | C．No problem | D．Cheer up |
Competitors are allowed to take a five-minute break every hour to eat，drink or do ________ is necessary
| A．which | B．that | C．where | D．what |