31. I haven't seen Tom ............... he gave me this book.
A. since B. for C. until D. before
32. ............ it is getting dark, she still waits for him.
A. Unless B. Since C. While D. Although
33. ....................... he has a headache, he has to take an aspirin.
A. How B. Because C. Where D. Although
34. Mary asked her husband: "What would you like for supper?"
He answered " ............... I am so tired, I want to have some shrimp soup"
A. However B. Moreover C. Since D. Although
35. ....................... it rained heavily, they went to school on time.
A. Even though B. despite C. Though D. A and C are correct
36. Our visit to Japan was delayed ............... my wife's illness.
A. because B. because of C. thanks to D. though
37. ............... he comes to theater with me, I shall go alone.
A. Because of B. Unless C. Because D. When
38. Trees won't grow .................. there is enough water.
A. if B. when C. unless D. as
39. The flight had to be delayed ................ the bad weather.
A. because B. due to C. because of D. B and C are correct
40. ................ she's busy, she still helps you.
A. Although B. Because C. Since D. As
41. ................. the traffic was bad, I arrived on time.
A. Although B. In spite of C. Despite D. Even
42. Take a map with you ............... you lose your way.
A. in case B. so C. because D. although
43. The play was very boring ................. they walked out.
A. although B. so that C. since D. so
44. I couldn't unlock it ................ I had the wrong key.
A. because B. so that C. since D. so
45. He agreed to go climbing .............. he hated heights.
A. although B. in case C. since D. because
