They (prepare) the Christmas dinner at the moment

1.       They (prepare) the Christmas dinner at the moment......................................................................................

2.       When I last (stay) in Cairo, I (ride) to the Pyramids on a camel that my friend (borrow) the day before...............

3.       Our teacher (tell) us yesterday that he (visit) England in 1970……...........................................................

4.       George (work) at a university so far.........................................................................................................

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

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

7.       I (lose) my key. (Can) you help me look for it?.............................................................................................

8.       My father (not smoke) for 5 years.................................................................................................................

9.       My teacher wasn't at home when I (arrive). He (just go) out..........................................................................

10.   How long Bob and Mary (be) married?.........................................................................................................

11.   You (receive) any letter from your parents yet?...............................................................................................

12.   My brother (join) the army when he (be) young............................................................................................