Help me please

Complete the second sentence so that it has a similar meaning to the first sentence using the word given. do not change the word given. you must use between two and five words, including the word given.
1. Students at university are allowed to miss some leassons (may)
Students at university_________
2. It is a good idea for you to write her a letter (should)
You____ a letter
3. It is necessary for me to lose weight (must)
I________
4. Only people who are sixteen can take part in the competition (have to)
You____ to take part in the competition.
5. You mustn't go to school without your books (need)
You______to school
6. It is not necessary to book seats before we go (have to)
We________book seats before we go.
7. it was impossible to stay indoors (couldn't)
We________the house
8. It is better if you drive more carefully (ought)
You________
9. I'll is better if you stay out till after midnight (don't)
You____back by midnight.
10. I don't believe she is from Argentina (can't)
She_____

Rewrite these sentences correcting the modal verbs.
1.The fires may have start as a result of the hot weather.
2. The police found a gun nearby. it must been the weapon used by the murderer.
3. You mustn't have closed the window last night because i found it open this morning.
4. the robbers may to have been the same gang as last time.
5. we not have to take our raincoats - the sun is shining.
6. you must to try harder to improve yourgrammar.
7. they must have repaired the lift. we don't know
8. after an eartquake, you shouldn't leave the building.
9. you don't have lost your matns book. you had it yesterday.
10. he's too fat. he must ought to take more exercise.