John promised his doctor he _____ not smoke and he has never smoked ever since. [ ]

If you are traveling ________ the customs are really foreign to your own，please do as the Romans do.

The big earthquake is still on ________ clothingis needed ________ in the mountain village

－ I need something for cutting the paper.－ Oh, you want a knife? OK, I’ll get ______ for you.

The knowledge that his friends have deserted him is a (n) ______ pill for Mr. Smith to swallow.