The flu is believed ____by viruses that like to reproduce in the cells inside the human nose and throat.
A. causing B. being caused C. to be caused D. to have caused
Seeing her father come back, _________.
A. tears ran down her cheeks B. Her tears ran out
C. she burst into tears D. She burst into crying
The old woman stood still with her eyes _________ the picture.
A. fixing in B. fixing on C. fixed in D. fixed upon
I can’t remember _____ made the teacher give Mary the permission to leave the class earlier.
A. that it was what B. what it was that C. what was it that D. that was it what
The thief was brought in, his hands ____________ behind his back.
A. had been tied B. tied C. being tied D. having tied
---Would you have helped her had it been possible?
---Yes, but I __________ busy with my work.
A. was B. had been C. have been D. am
