He doesn’t know ________ they will plant trees on Saturday or not.
| A．if | B．whether |
| C．where | D．how |
He wants to be an actor ________ it’s an exciting job.
| A．and | B．so | C．because | D．why |
I t is one of the _______ international airlines.
| A．busy | B．busier | C．busiest | D．most busy |
He goes to school ___ every day.
| A．by the bus | B．by bus | C．take bus | D．take a bus |
The woman can speak _______ Chinese.
| A．a little | B．a few | C．lot of | D．many |
It’s more_______ to climb the tall tree, be careful.
| A．danger | B．dangerous | C．busy | D．difficult |