The computer system________suddenly while he was searching for information on the Internet.
| A．broke down | B．broke out | C．broke up | D．broke in |
He ran as fast as he could _____ to catch the early bus.
| A．to hope | B．hope | C．hoping | D．Hoped |
. Everyone in our class was working hard and doing what we could _______ a good college.
| A．Enter | B．to enter | C．Entering | D．entered |
. You should ______ what your parents expect of you.
| A．live up to | B．stand up to | C．look up to | D．run up to |
. To my surprise， the manager ______ dollars from my salary without any good reason.
| A．cut off | B．held up | C．brought down | D．kept back |
. The mother often tells her son to be a good boy， warning him to ______ trouble.
| A．hold back from | B．keep out of | C．break away from | D．get rid of |