Everyone in the class studied very hard since no one wanted to _____.
A. fall down B fall off C. fall behind D. fall out
No matter how hard it is, just go on and never ____.
| A．give up | B．give away | C．give in | D．give off |
While you are doing math exercise, put a calculator(计算器) ____ to help you.
| A．in hand | B．at hand | C．by hand | D．on the hand |
Here you are! This is one of the keys ____ the lock.
| A．of | B．for | C．to | D．in |
I can’t ______ Tom. He is a real idiot(白痴).
| A．put up with | B．put away | C．put on | D．put up |