It was rude ______ you to stare at the foreigner when he passed by just now

Not only _____________ vital for reducing fever, but __________ also other things that it can help with.

Writing has ________ much of my spare time, but it has given me a great deal of pleasure. [ ]

eople have been ill from a strange disease thesedays, _____ we’ve never heard of before.

His uncle ________ for a week.