Giải giúp mình với ạ 
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XIII. Put the verbs into the correct tenses
1. If I meet him tomorrow, I (tell) him the truth.
2. You'd better take the day off if you (not feel) well tomorrow.
3. Unless you are more careful, you (have) an accident.
4. If you (have) enough time, please paint the chair before you leave.
5. If your mother buys you that new car, you (be) very happy?
6. I (accept) if they invite me to the party.
7. If he worked more slowly, he (not make) so many mistakes.
8. I'm very busy so I can't help you. If I (not be) so busy, I (help) you.
9. She is too young to get married. If she (be) older, she (get) married.
10. She (call) you immediately if she needed help.
11. He would understand it if you (explain) it to him more slowly.
12. I (give) you the money if I had it.
13. If I had the time, I (go) to the beach with you this weekend.
14. If you want to lose weight, you (eat) less meat.
15. I've hung out the clothes. It's lovely and sunny. If it (stay) like this, they (be) dry
in 2 hours.
16. If I had known that you were in hospital, I (visit) you.
17. He (be) arrested if he had tried to leave the country.
18. If I (try) again, I think I would have succeeded.
19. If he (work) harder at first, he (pass) his last exam.