It is demanded that the letter ___by the end of this week , dad !—-I’ll do it immediately .

I like the teacher__________classes are very interesting and creative.

Qinghai-Tibet Railway(青藏铁路) was completed last year. It is the __________ railway that connects Tibet with the other parts of China.

We must act now because time is _______.—Yes. Let’s start.

you drive a car? —No, I can’ t.