It is really a challenge for me to finish it. In order not to be disturbed, I spent three days ______ in my study surfing the internet to do the research.
| A．locking | B．locked | C．to lock | D．lock |
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 |
As soon as he comes back, I’ll tell him when _______ and see him.
| A．you will come | B．will you come | C．you come | D．do you come |
Mr. Smith is a painter, _____ I should also like to be.
| A．that | B．which | C．who | D．it |