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.