She looks very sad. I want to help her, but I just don’t know ____ to do it.
Try to spend as much time as possible ___________, please.
What made you_________ I was late last time?
Have you read the book __________ I gave you yesterday?
24 Hours is _____ one-hour round-up on CCTV-13. It starts at 23:00 every night.
The museum _______ from 9:00 a.m. to 5:00 p.m. every day. Let’s go together this Sunday.