The traffic was busy on our way to the train station, _____ we caught the train on time at last.
| A．although | B．so | C．but | D．because |
We had fun________ in the swimming pool last Sunday.
| A．swim | B．swimming | C．swam | D．swims |
There must be a boy ________ basketball outside the door. I hear him crying.
| A．play | B．plays | C．to play | D．playing |
Have you done ____ to improve the environment ?
| A．something useful | B．anything useful |
| C．nothing useful | D．useful anything |
—Who helped Betty tidy up the bedroom just now?
—________. She cleaned it all by herself.
| A．Somebody | B．Nobody | C．Everybody | D．Anybody |
The workers in the Huashan Mountains have to ______rubbish to keep the mountains clean.
| A．turn up | B．pick up | C．mix up | D．give up |