--They ________ out the problem, but failed.

    --What a shame ! I never thought it was going to happen like that.

    A. managed to work                   B. managed working

    C. sought working                     D. sought to work

--The plane is due to take off at 7∶50 from the airport.

    --________ we fail to arrive there in time?

    A. What if        B. As if             C. Even if          D. Only if

Come and see me whenever ________.

    A. you are convenient                  B. you will be convenient

    C. it is convenient to you               D. it will be convenient to you

They were all very tired, but ________ of them would stop to take a rest.

    A. any           B. some            C. none             D. neither

Many people in the west make ________ a rule to buy Christmas presents for their relatives and friends.

    A. this           B. it               C. that              D. them

--why don’t we choose that read to save time?

    --The bridge to it ________.

    A. has repaired    B. is repaired        C. is being repaired    D. will be repaired

The weather ________ be very cold at times, though it’s usually warm in spring in my home-town.

    A. can           B. may             C. must             D. will

My grandpa transplants some trees to his garden ________ it is the best time for them every year.

    A. where         B. when            C. that              D. until

--You ought to have given them some advice.

    --________, but who cared what I said?

    A. so I am        B. so am I           C. so did I          D. so I did

We rent a beach house with two small rooms, ________ can serve as a kitchen.

    A. the smaller of which                B. a smaller of which

    C. the smaller of them                 D. smaller of that