第二部分：英语知识运用（共两节，满分45分）
第一节：单项填空（共15小题；每小题1分，满分15分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21．To this end, an all-round, balanced and effective reform of the international system is thus _______ must to prevent __________ future repeat．
A．the; the B．a; the C．a; a D．the; a
The manager has _____ difficulty in finding a man to take _______place of the secretary
| A．a; the | B．the; 不填 | C．不填；不填 | D．不填；the |
--- I want to make a kite for my son..
---____ You can easily buy one in the market.
| A．Why not? | B．Good idea! | C．Why bother? | D．No way! |
---Did you reach the top of the mountain?
--- Yes. Even I myself didn’t believe I could make _____.
| A．that | B．it | C．myself | D．them |
____ the temperature down day by day, the leaves are turning yellow.
| A．For | B．With | C．Because | D．As |
A cool rain was falling ____ with snow causing heavy traffic.
| A．mixed | B．mixing | C．to mix | D．having mixed |