1. is / will drive

2. send / will receive 

3. will be / come

4. have / will do

5. will take / have

6. will be / fail

7. rains / will stay

8. will do / promises

9. will you do / don't have

10. will look / have

11. the weather is / we will drive

12. she sends / they will receive

13. Fred will be / Jack arrives

14. i will come / i have

15. she doesn't pass / she won't get

16. you will learn / you take

17. i get / i will go

18. i will buy / it doesn't cost

19. if you run / you will catch

20. i will go / i don't feel

21. if they win / they will be

Chúc em học tốt nhé!

-haihan-

1 . is/will drive

2 . send/will receive

3 . will be/come

4 . have/will do

5 . will take/have

6 . will be/fail

7 . rains/will stay

8 . will do/promises

9 . will you do/don't have

10 . will look/have

11 . the weather is/we will drive

12 . she sends/they will receive 

13 . Fred will be/Jack arrives

14 . I will come/I have

15 . she doesn't pass/she won't get

16. you will learn / you take

17. I get / I will go

18. I will buy / It doesn't cost

19. If you run / You will catch

20. I will go / I don't feel

21. if they win / they will be