—Where is David?
—He’s doing a(n) ________in the lab. He wants to find out why the chemicals can burn in sunny days.
A.experiment B.preparation C.creation
If you_________a person, you want him or her to have courage to do something.
A.invite B.encourage C.force
— Everyone has________the important parts on the blackboard. Why didn’t you do that?
—I’ve memorized them in my mind, Mr Green.
A.copied down B.taken up C.put off
We all went swimming______________ Tom，because he was ill at home.
A.with B.besides C.except
I am afraid we can not to take a taxi. Let's go by underground instead.
A.refuse B.afford C.forget
—What do you think of their advice?
—In a way, it is useful. However, it’s not perfect in the long run.
A.To a certain degree B.In addition C.By the way
