11. The pilot, whether ______ or design, made the plane do a sharp turn.
| A．by accident | B．at times | C．suddenly | D．all at once |
.
Listen, Mike. She ________________ have done it. She's been with me at the shop all day.
| A．couldn't | B．shouldn't | C．needn't | D．wouldn't |
.
—Do you want to go to the cinema tonight?
—Sorry, I’m so tired. I ___________ an early night.
| A．have | B．am having | C．have had | D．had |
.
With age, the mineral content of human bones decreases, ________ them more fragile.
| A．make | B．to make | C．made | D．making |
.
Let's go a little faster, ______________ we'll never get there on time.
| A．yet | B．or | C．so | D．and |
.
—How long have you been here?
—Only about five minutes. Henry and Simon _____________ here with me.
| A．walk | B．have walked | C．walked | D．had walked |