It's the second time that I __________ in Shanghai ! What great changes have taken place in Shang Hai. It is ten years since I __________ it last time.
We’re looking forward to _____ a wonderful holiday.
Excuse me, but can you tell me _____?
_____ he said is really interesting.
Mary often helps her best friend, ______ math is very poor.
Beijing is _____ capital of _____ China.