I.Choose A, B, C, or D to complete the sentences. 11. You shouldn’t spend too much time on computer __________ it is harmful to your eyes. A. as B. when C. although 12. I will phone you __________ I get there. A. while B. as soon as C. until 13. The scientist usually works in his lab __________ the sun sets. A. until B. as soon as C. although 14.__________ you promise not to tell lies again, l won’t forgive you. A. If B.Even if C.Unless 15.__________ her legs were hurt, she made attempt to finish the running track. A. Even if B. As if C. Even though 16. She talked __________ she witnessed the accident. But in fact she knew nothing. A. as if B. even though C. even if 17. I didn’t finish my homework __________ I was seriously ill yesterday. A. when B. though C. since 18. James decides to save money from now_____ he has enough money to travel this summer. A. so that B.though C. when 19. __________ we have been friends for only one year, we deeply understand each other. A. If B.Though C. Once 20. Mr. Smith doesn’t like dogs, __________ his wife loves them. A. when B. so that C. whereas 21. I was cycling home yesterday __________ I saw Jim standing near the fountain. A. when B. while C. since