life began on the earth is one of the biggest puzzles to scientists.

    A．How              B．What             C．Where            D．That

 —Your composition is full of mistakes.

   —I wish I        more careful.    

    A．would have been  B．had been         C．would be         D．were

 The film is very humorous but       can be enjoyed unless you understand English culture.

    A．everything           B．something            C. nothing          D．anythingh

 How        I help them to understand when they won’t listen to me?

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

 Of all the girls, Jane spent        time and made        mistakes.

A. less; fewer  B. much; many  C. the least; the fewest  D. more; most

 fit, we ought to learn more about our body and be careful with what we eat.

    A．Keeping          B．To keep          C．Having kept.     D．To have kept

 QQ,       you can chat with your friends, makes communication easy.  

    A．why              B．which            C．that             D．where

 In summer, food will go bad if       in room temperature.

    A．leaving          B．left             C．being left           D．having left

 Please turn down the music,        our neighbors next door will be disturbed.

    A．and              B．or               C．but              D．so

 —Are my clothes too casual?  

    —No. You can go         you are.

    A．as               B．what             C．that             D．where