用括号内所给动词的正确形式填空(共5小题；每小题1分。满分5分)

1. Since he fell off the bike, John   ▲   (lie) in bed for nearly a week.

2. We’ve worked for a long time. Let’s stop   ▲   (drink) some water.

3. You mustn’t touch the machines unless you   ▲   (allow) to.

4.—What’s his plan after he leaves school?

—He   ▲   (go) to Beijing for further education.

5.—Has the teacher finished marking the exam papers?

—Sorry, I don’t know. He   ▲   (mark) them in the office yesterday afternoon.

效果控制窗口不用于控制素材的（）切换。

A.运动

B.透明

C.切换

D.剪辑