She had just finished her homework________her mother asked her to practise playing the piano yesterday.

A. when
B. While
C. after
D. since

—I may go to the market this afternoon.—Could you please buy some fruit for me________you are there?

A. since
B. If
C. while
D. as

Theengineers aresobusythattheyhavezerotimeforoutdoorsportsactivities,_______theyhavetheinterest.

A. wherever
B. Whenever
C. evenif
D. asif

The girl had hardly rung the bell _____ the door was opened suddenly, and her friend rushed out to greet her.

A. before
B. until
C. as
D. since

_______ he had not hurt his leg, John would have won the race.

A. If
B. Since
C. Though
D. Then

My parents live in a small village. They always keep candles in the house _____ there is a power out.

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

You’d better not leave the medicine ______ kids can get it.

A. even if
B. which
C. where
D. so that

The engineer are so busy that they have zero time for outdoor sports activities, _______ they have the interest.

A. whever
B. whenever
C. even if
D. as if

______ our manager objects to Tom's joining the club, we shall accept him as a member.

A. Unitl
B. Unless
C. If
D. After

Choose the appropriate answer from the four choices marked A, B, C, and D.1. ______ difficult the task may be, we will try our best to complete it in time.A. No matter B. No wonder C. Though D. However2. ______ the day went on, the weather got worse.A. WithB. SinceC. WhileD. As3. Father was ______ busy in working ______ he often forgot rest or meals.A. very; thatB. so; thatC. such; asD. enough; as4. We had hardly got to the station ______ it began to rain.A. untilB. sinceC. whileD. when5. Helen listened carefully ______ she might discover exactly what she needed.A. in thatB. in order thatC. in caseD. even though6. ______ no one is against it, we will adopt the proposal.A. whileB. SinceC. ThatD. For7. It was _____ everyone went to the beach.A. so hot a weather thatB. such hot weatherC. a hot enough weather so thatD. a very hot weather so that8. I would like to go abroad ______ you do.A. as ifB. thoughC. asD. so that9. This dress is prettier, but it costs ______ that one.A. twice as many asB. as much as twiceC. as twice asD. twice as much as10. Anyone can borrow books from this library ______ he keeps them clean andreturns them in time.A. even ifB. as long asC. in order thatD. unless