By accepting lower prices, organizers can sell tickets that would ______ go unsold.
| A．therefore | B．otherwise |
| C．instead | D．however |
After going into the concert hall, the mother _____ a friend and went over to greet him.
| A．searched | B．know | C．spotted | D．realized |
_____ we gave him something to eat, he would save it up for his little sister.
| A．Whatever | B．However | C．Whichever | D．Whenever |
It is reported that large amounts of money _____ spent on the cross-sea bridge so far.
| A．was | B．has been | C．were | D．have been |
--- Have you told him we have changed the plan?
I _____ have, but I haven’t done it yet.
| A．must | B．ought to | C．needn’t | D．can’t |
Mr. Smith, _____ of the _____ speech, started to read a novel
| A．tired; boring | B．tiring; bored | C．tired; bored | D．tiring; boring |