Put the verb into the correct form (Past Simple or Present

Put the verb into the correct form (Past Simple or Present
Perfect).
11. You are late for the

classes again. You . . . (to be) already late once this week. 12. Jill . . . (not to write)

to me for nearly a month. 13. It . . . (to be) cold in winter in Moscow as a rule? - Yes,

generally it . . . (to be), but this winter it . . . (to be) very warm. 14. Where is Peter? -

He . . . (to go) to the library. 15. You . . . (to read) anything by Mark Twain? Which

of his novels you . . . (to read) when a child? 16. I . . . (to be) recently to this picture

gallery. There . . . (to be) a very interesting exhibition on. 17. Tom . . . (to lose) his

key and cant open the door. He . . . (to lose) his key yesterday. 18. I ( to phone) him

an hour ago, but he (to be) at home . 19. You (to meet) Peter yet, but I am sure you

will like him. 20. I (to start) learning English at school and then (to go on) studying it

at the Institute.