—May I smoke here ?—If you ____, choose a seat in the smoking section. 

But for their help, we        the program in time.

I’d rather he ______ tomorrow afternoon.

– Mum, would you please buy me a MP5 player?– If you can help do the dishes the whole vacation，you________have one as a reward·

She is a bit shy and _______ stand up and answer the teacher’s questions.