1. He can…at the problem alone. a) to work; b) be working; c) work. 2. I am sorry…late yesterday. a) to come; b) to have come; c) have come. 3. The teacher lets his students…at lessons. a) to speak; b) to have spoken; c) speak. 4. You should…tests now. a) write; b) be writing; c) to be writing. 5. Nick saw the cat…the tree. a) climb; b) to climb; c) be climbing. 6. You'd better…about it. a) To think; b) to be thinking; c) think. 7. Would you like…a little? a) to dance; b) dance; c) have danced. 8. The rule is difficult… . a) To understand; b) to be understood; c) be understood. 9. I'd rather…this book. a) To buy; b) buy; c) be bought. 10. I am happy…by my friends. a) visit; b) to visit; c) to be visited. 11. I could…you at the lesson. a) to help; b) helping; c) help. 12. He seems…now. a) To be reading; b) to have read; c) to read. 13. He didn't expect…to the exhibition. a) being taken; b) to take; c) to be taken. 14. He is glad…to the party. a) to have invited; b) to have been invited; c) to be invited. 15. As a child Ted used…his bike every day. a) to be riding; b) ride; c) to ride. 16. On the way home I stopped…a newspaper. a) buy; b) buying; c) to buy. 17. Remember…the dog before you leave. a) feed; b) to feed; c) about feeding. 18. He is too young… a) Getting tired; b) get tired; c) to get tired. 19. I am happy…with you for an hour. a) to speak; b) to have been speaking; c) to be speaking. 20. English should…to regularly. а) listen; b) to listen; c) be listened