. It was not until 1920 _____ regular radio broadcast began.
| A．that | B．while | C．which | D．since |
—Dad, can I surf the Internet?
—Again? I wish that you ______ going on line ______ your health.
| A．know; will do harm to | B．knew; are doing harm to |
| C．know; have done harm to | D．knew; were doing harm to |
—I wonder why he has been acting so strange these days.
—Recent pressure at work may ______ his behavior.
| A．account for | B．make for | C．change for | D．stand for |
The digital camera in our shop is of high quality. If there_________ be something wrong with it while it is still under guarantee, we would repair it __________ our expense.
| A．would ; on | B．might; from | C．could; with | D．should; at |
第二部分：知识运用（共两节, 满分35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,并在答题卡上将该项涂黑。
When armed with ______ awareness of what you truly value, you are in ______ excellent position to pick a career you will find rewarding.
A. an; an B. the; an C. an; the D. the; the
Before going abroad he devoted all he could ____ his oral English.
A. to improve B improving C. to improving D. improve