Not until I began to work ____ how much time I had wasted.

A: Listen! Is it Tina singing in the next room?B: No, it __________ be her. She is still in Shanghai.

_____ weekdays, what time do you get up?[ ]

Chinese is becoming more and more popular. It ________ in many schools in foreign countries.

What can Jane do?—She can play chess and also violin.