31, Our teacher (tell) told us yesterday that he (visit) visited Singapore in 2010.

32, Geogre (work) has worked at the university so far.

33. When he lived in Manchester, he (work) worked in a bank.

34, Birds (build) build their nests in summer and (fly) fly to the South in winter.

35, I (lose) lost my key. (can) Can you help me look for it?

36, My father (not smoke) hasn't smoked for five years.

37, My teacher wasn't at home when I (arrive) arrived. He (just go) had just gone out.

38, How long Bob and Mary (be) have been married?

39, Have you (receive) received any letter from your parents yet?

40, My brother (join) joined the army when he (be) was young.

Chúc bạn học tốt!!

(Cho mình 5* với ctlhh nha!!)

31. told...had visted 

32. has worked 

33. worked 

34. build...fly 

35. have lost... Can

36. hasn't smoked 

37. arrived ... had just gone 

38. have Bob and Marry been 

39. Have you reveived 

40. joined... was