Modal verbs with a perfect infinitive - Modal verbs with the perfect infinitive

Modal verbs with a perfect infinitive convey an action related to the past. However, along with the past meaning, the whole situation acquires an additional semantic connotation. For example, the modal verbs should and ought combined with the perfect infinitive (should have done, ought to have done) means that someone has not done what is needed was done in a certain situation:
The flowers have withered. - You should have watered them (but you didn’t). The flowers have withered. - You should have watered them (but you didn't).
You ought to have helped him (but you didn’t). You should have helped him (but you didn't).
Negative forms shouldn’t have done, oughtn’t to have done are used in situations where someone's actions are considered illegal and it is emphasized that this should not be done:
Why did you tell him the news? You shouldn’t (oughtn’t to) have done it - he feels very upset.

Correct answers out of10. Result:

Choose the correct infinitive form to match the modal verb.

1. I haven’t seen George for a long time. He must his workplace as he had once promised.
2. Sue has refused to come to the party. She may for her maths exam.
3. You should more responsible and hard-working, otherwise you’ll lose your job.
4. I don’t understand how the accident has happened. The driver can’t the pedestrian crossing the street.
5. Where is Jane? — She may the shopping and has forgotten about our meeting.
6. We planned to go abroad this summer but we didn’t. We could , but some unforeseen circumstances prevented us from doing this.
7. You needn’t him twice of anything. He is fully concentrated on his duties.
8. The Browns’ house has been burgled. They should always the doors and the windows when leaving
9. They don’t hear the doorbell. They might .
10. Mabel is well-educated and has good manners. She can’t like that.