I didn’t see Tom yesterday. Do you know ?A、what happened with him B、where he has beenC、why didn’t he come
We must be strict _____ ourselves and strict _____ our work.
Now more and more people prefer__to__in order to reduce the air pollution.
They would rather___colours like orange or yellow than blue or white.
Do you like ____ books ?
Lingling and Daming are _____ .