IV.choose the best answer:
1.They.............students yesterday.
A.am             B.is                       C.was                D.were
2.They ............. doctors two years ago.
A.am             B.is                         C.was             D.were
3.They ............... farmers last month.
A.are             B.is                       C. was              D.were
4.We ................nurses yesterday
A.am            B.is                          C. was             D.were
5.The weather............cold yesterday .
A.am            B.is                          C. was             D.were
6. I...............a pupil last week.
A.aren't           B.isn't                 C.wasn't                D.weren't   
7.My parents ...............teachers two years ago.
A.am                 B.is                    C.was                     D.were
8..........he am enineer yesterday . No,he...............
A.is/isn't              B.Are/aren't              C.was/wasn't                D. were / weren't
9................It hot last week?
A.am                      B.is                            C.was                          D.were 
10.Where ......Nam from yesterday .
A.am                      B.is                            C.Was                          D.were