10. Choose the correct answer. 1. How long English? a) have you do b) do you do c) have you been doing 2. Tim out. He'll be back in a couple of minutes. a) went b) has gone c) has been 3. I didn't hear the phone ring. I must a) be asleep b) have been asleep c) be sleeping 4. How long - _ in London when you were in Britain? a) have you stayed b) have you been staying c) did you stay 5. Peter the Great a) founded the city of St. Petersburg. b) has founded c) found 6. I don't think you're right. It a) mustn't b) can't be true! c) can to