--You don’t look ______ today. What’s wrong?
--It’s the bad fever.
| A．well | B．happily | C．hard | D．strongly |
Sometimes parents find ______ hard to communicate with their children.
| A．this | B．that | C．it | D．one |
Nowadays scientists are working hard to find out ______ to do with air pollution.
| A．how | B．why | C．when | D．what |
Good teachers can usually give the students______ advice on their study.
| A．a great many | B．huge amounts of |
| C．a large number of | D．too many |
Chinese people have been using paper for over______ years.
| A．thousands | B．two thousand | C．thousands of | D．thousand |