We ________ a sign at the park entrance to tell people to protect the trees and flowers.
A. put down B. put up C. put away D. put off
What are you doing out of bed? It's very late. You are ________ to be asleep.
A. supposed B. believed
C. challenged D. invited
－You haven't switched off the light.
－Oh, don't worry.I ________ and turn it off.
A. will go B. go
C. have gone D. went
Cathy stopped working when her son was born __________ she could stay home and take care of him.
A. even if B. so that C. unless D. while
－Did you see a girl in red pass by just now?
－No, sir. I __________ a newspaper.
A. was reading B. read
C. had read D. would read
It was so noisy outside that we ____________ hear what they were talking about.
A. mustn't B. didn't have to
C. ought not to D. couldn't
