Although research scientist had hoped that the new drug interferon____to be a cure for cancer, it’s applications now appear to be more limited.

The theory of continental drift assumes that there____long-term climatic changes in many areas during the past.

A.must have been

B.must be

C.must have

D.must

the man standing over there asked me whether he____the flowers from my garden.

Look at this street. it is very muddy. it____have rained heavily last night.

... you pass me the paper?

Bayu broke his leg. He ... walk from now.

I regret that I ... take care of my parents when they were alive.

What ... you like to have for lunch? Rice or the other?

Nanda ... rest well last night. She felt fresh when she woke up.

I'm tired. I think ... go to the bed now.

A year ago, I ... get in contact with my brother because he changes his number.

Why did you stay at hotel in Jakarta? You _____ stayed with your uncle

This bag is very heavy. Please help me, I _____ take it by myself.

I have lived in England for two years, so I _____ speak English fluently.