____ I swim here?—I’m sorry. Children ____ swim alone here..

Hello, May I speak to Mr Black?—Sorry, he ______ Hong Kong for a meeting and he______ back in a week.

If you try to sit on two chairs,you will fall them .For life,you must choose one chair.[ ]

_____is too hard _____ a good solution to this problem.

It’s very nice _______ you to give me the chance. [ ]