To understand the grammar of the sentence, you must break it ______into parts.
| A．up | B．out | C．off | D．down |
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 |
--- Alice , you feed the bird today , ______?
--- But I fed it yesterday .
| A．do you | B．will you | C．didn't | D．don't you |