Вопрос по английскому языку:

Choose the right variant.

1. You __ take care of you.
a) should b) ourght to c) must

2. Don't you see I'm tired? You __ me, you know.
a) might have helped b) could help c) may help

3. Police __ work on holiday in the USA.
a) could b) might c) must

4. We __ learn from the past.
a) may b) need c) must

5. We __ commemorate great people.
a) must b) need to c) may

6. Excuse me, __ you tell me the way to the Houses of Parliament, please?
a) could b) may c) must