. The police refused to _____ the clues they were working on.
| A．exhibit | B．disclose | C．expose | D．discern |
______ I could say a word, she had stormed out of the room.
| A．When | B．As | C．While | D．Before |
One of the best ways for people to keep fit is to ______ healthy eating habits.
| A．grow | B．develop | C．increase | D．raise |
I’m sorry to say you didn’t pass the exam-- ______, you won’t receive the diploma.
| A．on the whole | B．believe it or not | C．in other words | D．after all |
—John, why are you so tired?
—I ______ pingpong with Jimmy.
| A．play | B．played | C．have played | D．have been playing |
_______ I explained on the phone, your request will be considered at the next meeting.
| A．When | B．After | C．As | D．Since |