Tom got all A’s ________ he spent most of his time studying.

He met many problems            he was going over his lessons.

–Little boy, don’t play with the knife, __________ you’ll cut your hand.  –Sorry, I won’t.

_______ they were not rich, they tried their best to send their child to the best
school. 

     he studied hard every day,      he didn’t pass the exam.

—Tom, you look tired this morning. What’s wrong?
—I was so busy that I didn’t go to bed _____ 12 o’clock last night.

- May I go to the movies with you?
- I’m afraid not     you have a ticket, because I have only one.
A． if                    B. unless                C. though

–What was your brother doing at this time yesterday?
–He was reading a magazine ________ I was writing an e-mail at home.

We can talk with friends on the Internet _______ it’s easier and cheaper.

—Do you like sports?
—Yes, I do some running in the park everyday _______ the weather is terrible.