Mrs White found her husband surrounded by letters andpapers and ______very worried

It was in the dining hall _______ was located behind the teaching building _______ I met her for the first time.

Giving children pocket money as a giftduring the Spring Festival is a common _______ in China.

nds of years ago peoplediscovered the phenomenon by chance, and this was _____ the idea of the compassfirst came from

having a lot of trouble with the newcomputer,but she doesn’t know whom to______.