I will never forget the day _____ we spend together.
| A．when | B．on that | C．which | D．while |
_____ is known to everybody, the moon travels round the earth once every month.
| A．It | B．As | C．That | D．What |
It is so difficult a problem that _____ student in this class _____ work it out.
| A．any, can't | B．no, can | C．every, can | D．no, can't |
Shirley _____ a book about China last year, but I don't know whether she has finished it.
| A．has written | B．wrote | C．had written | D．was writing |
Who did the teacher have ___ an article for the wall newspaper just now?
| A．written | B．writing | C．write | D．to write |
Use an umbrella to _____ you from the rain.
| A．stop | B．prevent | C．keep | D．protect |