36. She couldn’t unlock it _________ she had the wrong key.

A. while B. but C. though D. because

37. We watched TV the whole evening ________ we had nothing better to do.

A. because B. though C. so D. but

38. They decided not to go out for a meal _______they were too tired.

A. so B. because C. but D. if

39. Last night we came to the show late ______ the traffic was terrible

A. although B. despite C. and D. because

40._____ his broken leg, he didn’t come to class yesterday.

A. Because B. Because of C. Despite D. So

41. I almost missed my flight there was a long queue in the duty-free shop.

A. although B. since C. despite D. because of