57.　　 57.　　 The earliest kind of desk was a box that had a sloping lid _______ there was storage space for writing materials.

a. under that　　 b. under which　　 c. which　 d. that

56.　　 56.　　 ______ a baby kangaroo is four months old does it begin to live outside its mother’s pouch.

a. Until　　 b. Not until　　 c. After　　 d. Only until

55.　　 55.　　 Although Mr smith is one of those teachers who appear to be friendly, ______ he is very hard to deal with.

a. but　　 b. so　　 c. so that　　 d. yet

54.　　 54.　　 ______ he came to England to study, he didn’t know how to cook.

a. When　　 b. since　　 c. Until　　 d. Unless

53.　　 53.　　 Professor Smith was so punctual ______, he always arrived to class just as the bell rang.

a. that the day he died　　　　　 b. until the day he died

　 c. that until the day he died　　　 d. until the day when he died

52.　　 52.　　 Contrary　 to ______ I had expected, he lost for a second time.

a. that　　 b. what　　 c. which　　 d. who

51.　　 51.　　 Now we may be able to say ______ between music and noise or just sound.

a. what is the difference　　 b. the difference is what

　 c. what the difference is　　 c. that what the difference

50.　　 50.　　 Einstein’s theory of relativity seemed hard to believe at the time ______.

a. when he first introduced　　 b. that he first introduced it

　 c. he first introduced　　　　 d. which he first introduced it

49.　　 49.　　 Group work is a method of teaching ______ tasks and activities are carried out by small groups of pupils.

a. which　　 b. that　　 c. for which　　 d. in that

48.　　 48.　　 The rose may grow as a low bush or as a tree, depending on ______.

a. what it is trimmed　　 b. how it trimmed　　 c. that is trimmed　　 d. how it is trimmed