________ these experiments were successfully completed would we think of going into humans.
| A．If only | B．Only if | C．So that | D．Even if |
The woman burst into tears ________she was announced the winner.
| A．that | B．instantly |
| C．unless | D．in case |
_______ you don’t have much experience in this field, why don’t you ask Professor
Wang for advice?
| A．Unless | B．In case |
| C．As long as | D．Now that |
Why ________ it rain on Sundays? We can’t go camping as planned. What a pity！
| A．should | B．can |
| C．must | D．may |
—Shall we have a smoke here?
—No, we _____ because this is gas station and the worker is carrying some petrol.
| A．can’t | B．needn’t |
| C．mustn’t | D．won’t |
I am decorating my office now. I _______ comfortably in my office at this time tomorrow.
| A．am sitting | B．was sitting |
| C．sit | D．will be sitting |