1. She accepted the invitation __   _she didn't really want to.

    A. in case     B. although     C. provided     D. since

    2. I don' t know what decision was taken at the conference __   _our representative hasn't reported to me yet.

    A. because     B. as     C. provided     D. for

    3. Don' t eat that fruit __   _ it is ripe.

    A. in case     B. unless     C. if    D. so that

    4. Tom insured his car__   _he had an accident.

    A. unless     B. if    C. in case     D. since

    5. Let' s talk all this over again __   _ we make a final decision.

    A. after    B. before     C. while     D. when

    6. Water power stations are built __   _ there are big water falls.

    A. so that     B. where     C. in which     D. in case

    7. Precautions are taken __   _ a hurricane threatens to strike the coast of the United States.

    A. whenever     B. however    C. whether     D. until

    8. __   _he does， man is bound to alter the environment.

    A. However   B. Whatever   C. No matter   D. Whenever

    9. We have never quarreled __   _ we have worked together.

    A. until   B. once   C. ever since   D. as soon as

    10. Put your luggage in the van quickly __   _ the train will be off in a minute.

    A. before     B. now that     C. so that     D. unless

    BABCB BABCB