a.        the…the    b. a…a    c. the…/    d. /…/

20.Tianan Men Square and ______ Great Wall are tow of the places everyone should see in ______ People’s Republic of China.

a.        the…the   b. /…/   c. the…/    d. /…the

21.It has long been known that there is an electric field ______.

a.        inside the earth   b. inside earth   c. inside an earth   d. on earth

22.______ much harder work, the volunteers were able to place the raging forest fire______.

a. By the means of…under the control     b. By means of…under control

c.By means of…under a control          d. By a means of…under control

23.No sooner had the man departed than the tree began dropping coffee beans ______.

a.        by the thousand    b. by a thousand    c. by thousands    d. by thousand

24.He expressed ______ of their having ever been married.

a.        the doubt    b. a doubt    c. doubt    d. an doubt

25.He saw through the little boy’s tricks ______.liuxuepaper.com