The mother said, “ Be friendly to others.” The mother ____ friendly to others.
Once new difficulties ________in your work, it’s always important to use your brains.
--How are your recent trip to Sichuan? —I’veneverhad ______ onebefore.
Shy people often avoid situationswould force them into close contact with other people.
—How long do you think it will be______man can finally solve the problem of cancer? —Well,it depends
______ is known to us is that tobacco contains nicotine and other harmful products, so you should give up smoking.