It【C1】______around nine o'clock when I drove【C2】______home from work because it was alread

y dark. As I approached the gates I switched off the headlamps of the car【C3】______prevent the beam from swinging in through the window and waking Jack, who shared the house with me. But【C4】______. I noticed that his light was still on. So he was awake anyway, unless he'd【C5】______asleep while reading. I put the car away and went up the steps. Then I opened the door quietly and went to Jack's room. He was in bed awake but be didn't【C6】______turn toward me.

"What's up, Jack？" I said.

"For God's【C7】______, don't make a noise," he said.

The way he spoke reminded me【C8】______someone【C9】______who is afraid to talk in case he【C10】______himself a serious injury.

"Take your shoes【C11】______, Neveille," Jack said.

I thought that he must be iii and that【C12】______humour him to keep him happy. "There's snake here," he explained. "It's asleep【C13】______the sheets. I was【C14】______on my back reading when I saw it. I knew that moving was out of【C15】______. I【C16】______moved even if I'd wanted to."

I realised that he was【C17】______, "I was relying【C18】______you to call a doctor as soon as you【C19】______home.” Jack went on. "It hasn't bitten me yet but I daren't do anything to upset it. It might wake up. Fm sick of this,” he said. " I look it for granted that you'd be home an hour ago."

There was no time to argue or apologize【C20】______late. I looked at him as encouragingly as I could and went to telephone the doctor.

【C1】

A．had to be

B．was to be

C．must have been

D．should have been