Biology is ____

        A.science of life    B.science of the life   C. the science of the life  D.the science of life

This chemical works _____.

        A. is rebuilding   B. is being rebuilt    C.are being rebuilt    D. is being rebuilt

I want to buy two ___ of colour ___.

        A.boxs…chalks    B.boxs…chalk   C.boxes…chalks    D.boxes…chalk

 Turn on the television or open a magazine and you ____ advertisements showing happy families.

A. will often see B. often see C. are often seeing D. have often seen

_____there be a flood this summer, what would we do?

   A. Should     B. Would     C. If      D. Will

— What great trouble I have solving this problem now！   

  —_____ my advice, you ________less trouble.

   A. If you had taken, would have had     B. If you took, would have 

   C. If you had taken, would have        D .If you take, will have

I wonder why Jenny ____ us recently. We should have heard from her by now.

A. hasn’t written        B. doesn’t write      C. won’t write       D. hadn’t written

Just in front of our house ___ with a history of 1,000 years.

A. does a tall tree stand B. stands a tall tree

C. a tall tree is standing D. a tall tree stands

She's too thin. She ____ gain some weight but she _____ too little.?

　　A. would, ate       B. will, eats ?  C. would, eats    D. will, ate??

Each of the students, hoping to pass the exam, _____the book.?

　　A. buying    B. having bought    C. should buy    D. to buy?