We spent about one-third of our lives sleeping. We know relatively little about sleep.

A. He objected to calling me as soon as he arrived at the airport.

B. He promised to call me as soon as he arrived at the airport.

C. He denied calling me as soon as he arrived at the airport.

D. He reminded me to call him as soon as he arrived at the airport.

A.  Only after his leaving the school did Peter inform us of his arrival at the meeting. 

B. Not until Peter told us that he would leave the school did he arrive at the meeting. 

C. Hardly had Peter informed us about his leaving the school when he arrived at the meeting.

D. No sooner had Peter arrived at the meeting than he told us about his leaving the school.

A. Before she worked as a hospital volunteer for years, the young girl has great experience of nursing.

B. Much as she has worked as a hospital volunteer for years, the young girl has great experience of nursing.

C. Having worked as a hospital volunteer for years, the young girl has great experience of nursing.

D. With great experience of nursing, the young girl has worked as a hospital volunteer for years.

A. They always leave for work at 6.00am.

B. They have to leave very early to catch a bus to work.

C. Getting to work on time, for them, means leaving at 6.00am.

D. Leaving at 6.00am, they have never been late for work.

A. The lady threatened to call the police if the man didn’t leave her house.

B. The lady said that she would call the police if the man didn’t leave her house.

C. The lady told the man that she would call the police if he didn’t leave her house.

D. The lady informed the man that she would call the police if he didn’t leave her house.

A. I arrived very late to say goodbye to her.

B. She had left because I was not on time.

C. I was not early enough to see her off.

D. I didn’t go there , so I could not see her off.

A. If I had known you were coming, I wouldn’t have waited for you.

B. I would have waited for you if I knew you were coming.

C. If I had know you were coming, I would wait for you.

D. Had I known you were coming, I would have waited for you.