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He always brings me a pretty gift _______ he comes to visit me.

A small car is big enough for a family of three ________ you need more space for luggage.
A. once       B because               C. unless             D. in case

The homework is not as heavy as ________he used to get. All________ he needs to do is improve English.

_______ he lives in a rich family, he started from the lowest position as an ordinary worker to make his living.

The cousins are alike in age，but ________ they are as different as day and night.

None of the underwater workers has been harmed by the great fish. ________, most fish were so friendly that they played with the instruments.

---What should we do since we can’t make a compromise after lengthy talks？
--- ____ you apologize and take back what you’ve said _____ it is all over between us.

You can’t use my bike _____ you return it to me by the weekend.

Loulan city is not at all        a traveler who has never seen the desert before can imagine.

John thought it wouldn’t be long _____ he was ready for his new job.