Many people do not realize the importance of health __________ they have fallen ill.

My God! I haven’t prepared the files forthe new project yet!— _______ The boss won’t needit until next Friday

I think it is necessary for my 19-year-old son to have his own mobile phone, for I sometimes want to make sure if he _____ home for dinner.

Would you like to walk along Yueya Lake with me tomorrow afternoon—Certainly, ______ I am too busy.

there is no such thingas a free lunch in the world, one millionpeople of the city decided to build their home by themselves.