There are some trees _____ our classroom.
| A．in front | B．in the front of | C．in front of | D．front of |
Our English ______ far better in a month if we try harder.
| A．becomes | B．will become | C．has become | D．became |
Who is ______ of the three young men?
| A．clever | B．cleverer | C．cleverest | D．the cleverest |
--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 |