It looks ___ to wash the clothes.

    A. as if the water is dirty enough      B. as if the water is not clean enough

    C. that the water is not dirty enough   D. that the water is clean enough

You will be able to get good marks _____.

     A. while you are doing your homework by yourself

     B. if you do some revision every day

     C. before you begin to study hard

     D. until you follow your teachers’advice

The book was so interesting that he had read it for three hours __ he

realized it.

     A. unless       B. if        C. after         D. before

John fell asleep ___ he was listening to the music.

     A. after       B. before      C. while       D. as soon as

—This dress is in last year’s style.

      —I think it still looks perfect ___ it has gone out this year.

     A.so that       B. even though    C. as if     D. ever since

Mary was ____ ill ___ she got the disease that her mum had to stop

working to look after her.

    A. such ;if      B. so; if       C. such; when     D. so; when

The poor man ate a big breakfast ___ he said he was not hungry.

     A. since        B. because      C. though         D. for       

語法練習(xí)

We didn’t catch the train ____ we got up late.

     A. so           B. because      C. until          D. before

— What do you think of this book?  

      — 　　　.

      A. It’s ten yuan           B. It’s my brother’s   

      C. It’s interesting        D. It’s a gift for me

— When will we start?

       — As soon as your uncle 　　　.

      A. arrives    B. will arrive    C. was arriving   D. to arrive