Прошу помощи

Choose the correct variant
1. Where are the children? They …. in the garden.
a) played b) play c) are playing
2. George …. at work last week because he ….. ill.
a) hasn’t been, was b) didn’t be, is c) wasn’t, was
3. How much ... it ….to send a letter to Canada?
a) does cost b) is cost c) do cost
4. The City Museum …… at 5 o'clock every evening.
a) closed b) has closed c) closes
5. Mozart …..from 1756 to 1791.
a) has lived b) lives c) lived
6. Do you want the newspaper? No, thanks I…. already ….. it.
a) have read b) read c) am reading
7. Put the old bread in the garden. The birds ….. it.
a) are eating b) will eat c) ate
8. It's Kate's birthday tomorrow and I …. her a present yet.
a) didn’t buy b) hasn’t bought c) haven’t bought