51. I will______ the idea with the other teachers and see what they think about it.

A. explain

B. argue

C. discus

D. talk

52. You will become ill ______you stop working so hard.

A. until

B. when
C. unless

D. if

53. ’ll hand over all my files to my assistant before I______.

A. am leaving

B. leave

c. will leave

D. shall leave

54. ’m looking______ the summer holidays.

A. before

B. forward

c. for

D. forward to

55. When Mr. Brown’s daughter______ from university, he will be retired.

A. will be graduating

B. graduates

C. has graduated

D. will graduate