small children some money as a giftduring the Spring Festival is a common ______ in China, which may seem strangeto foreigners

It was after he had read the requirements _______ Mr. Black realized the task was too difficult to be finished.

I’ll keep his address _____ I need it

Not until he retired from teaching three years ago having a holiday abroad.

Whether at school or at home, children should be encouraged to read books and ______ what may be useful to their study.