People cut down too many trees, _____ the greenhouse effect becomes more and more serious.
| A．so | B．because | C．although | D．if |
—Is your brother in?
—No.________ he comes back, I’ll tell you.
| A．As | B．As soon as | C．After | D．Since |
— I’m going to the Fairy Mountain tomorrow.
—________
| A．No way! | B．It’s my pleasure! |
| C．Have a good trip! | D．It’s hard to say! |
Miss White ________50,000 yuan building the Hope School after visiting that village.
| A．took | B．paid | C．cost | D．spent |
I ________ a letter from him this morning. I felt very excited.
| A．wrote | B．received | C．sent | D．read |
Remember to ________ the lights before you leave the classroom.
| A．turn off | B．turn on | C．turn up | D．turn down |