--Can I help you?--I'd like to buy a present for my father's birthday, ___________ at a proper price but of great use.
——Hi, Steve, you look tired. ——I am tired. I ______ the living room all the afternoon.
________by the beauty of the West Lake, Mary decided to stay for two more days in Hangzhou.
Go and see her whenever _____.
Having won the first place in the English examination, Tom ran back home, .
After _______ seemed half an hour, the teacher gave us the correct answer.