－You must say sorry to Mary, Jack.
－Why ________ I say sorry to her? It’s her who hurt me first.
| A．should | B．would | C．could | D．might |
Do you think the reason ________ he gave is believable?
| A．for which | B．which | C．why | D．what |
This is an illness that can result in total blindness ________ left untreated.
| A．after | B．if |
| C．since | D．unless |
Paper produced every year is ________ the world’s production of vehicles.
| A．the three times weight of | B．three times the weight of |
| C．as three times heavy as | D．three times as heavier as |
--You should have thanked her before you left.
---I meant _______. But when I was leaving I couldn’t find her anywhere.
| A．to do | B．to | C．doing | D．doing so |
It is thought that one billion people I the world, _is half the word’s workers, earn their living by farming.
| A．if | B．that | C．which | D．what |