16 hear - heard                            xin câu trả lời hay + vote 5 + cảm ơn

17 help - helped

18 find - finding

19 be - is 

20 win - will win

21 be - is

22 telephone - will telephone

23 help - helped

24 come - comes

25 make - made

26 hurry - hurried

27 open- opening

28 show - shown

29.waited

30.wrote

31.joined

32.were

33.knew

34.were

35.were

36.made

37.didn't forget

38.hadn't snowed

39.were

40.lived

16 heard          

17 helped

18 finding

19 is 

20 will win

21 is

22 will telephone

23 helped

24 comes

25 made

26 hurried

27 opening

28 shown

29 waited

30 wrote

31 joined

32 were

33 knew

34 were

35 were

36 made

37 didn't forget

38 hadn't snowed

39 were

40 lived