_____ these experiments were successfully completed would we think of
going into humans.
| A．If only | B．So that | C．Only if | D．Even if |
By the time our teacher arrives tomorrow, all the work _____,with which he will be content.
| A．is accomplished | B．will have been accomplished |
| C．will be accomplished | D．has been accomplished |
Don’t ask him how he is because if he starts talking about his health you’ll never
_______ him.
| A．get away from | B．come up with | C．break up with | D．put up with |
The life of a high school student is usually active, exciting and full of fun, but it ______ be stressful sometimes.
| A．must | B．can | C．need | D．should |
The girl sitting by the window is the only one of the students who _______ from the countryside in our class.
| A．was | B．were | C．is | D．are |
---How did you do in the test yesterday?
-----Not so well. I ______ much better but I misread the directions for writing。
| A．will have done | B．could have done |
| C．must have done | D．may have done |