Standing on the top of the hill, you can get a good ________of the whole city.
John promised his doctor he _____ not smoke and he has never smoked ever since.
According to the air traffic rules, you ___ switch off your mobile phone before boarding.
When I was young, I was told that I ______ play with matches
-What sort of house do you want to have? Something big? --Well, it ______ be big--that's not important.
—I can’t find my purse anywhere. —You __ have lost it while shopping.