I don’t like science _____ it’s difficult.

---Excuse me. Do you have a table for ten?
---I’m sorry, ______we have a table for eight.

Please give me a call and let me know ________you will come back for dinner.

____you want to be in the school play , please call Tina at 555-395 .

People cut down too many trees, _____ the greenhouse effect becomes more and more serious.

— Do you like this shirt?
— Yes, ____ I don’t like the color.

We knew little about Shu-How Lin, a basketball player from New York Knicks, __________ we watched the basketball matches in NBA.
A. until           B. if                   C. when              D. because

— Excuse me. Do you have a table for two?
— I’m sorry,            there aren’t any seats now. Would you mind waiting a while?

Don’t put your hand out of the car window, ______ you will be hurt by the passing traffic.

—Would you like to go for a walk with me?
—I’d love to, ________I’m afraid I have to finish my homework first.