2 .___      (正如我们所知),energy has the ability to do work.

1. It seems impossible__      (有时）.

(   ) 5. They are considering        before  the prices go up.

A. of buying the house

B. with buying the house

C. buying the house

D. to buy the house

(   ) 4. In some parts of London,missing a bus means

       for another hour.

A. waiting     B. to wait

C. wait     D. to be waiting

(   ) 3. The chemistry teacher required the students

       more  attention        the  lab clean.

A. to pay,to keep

B. to paying,to keeping

C. to pay,to keeping

D. paying,keeping

(   ) 2. He is the inventor of the dynamite(炸药）and

       one  of the greatest chemists and scientists.

A. regarded as  B. regard as   

C. regards as  D. regarding as

(   ) 1. Life in the year 2150 is very different        life in the 21st century.

A. of     B. from

C. in     D. with

5. The new house was the p        of  the  whole family.

4. You will make a m        by using the improper tool.

3. He faced the difficulty with c        .