So many uses have been discovered for this wood __________ the supply of white pine is becoming smaller and smaller.
| A．then | B．what |
| C．that | D．which |
It’s possible that Paul was linked to the attempted murder; he _____ have had a hand in planning it.
| A．must | B．might | C．should | D．would |
The old man has retired from the factory. He _____ there for 30 years.
| A．works | B．worked |
| C．has worked | D．was working |
Generally, _____ to a university in western countries, international students need to prove their ability to speak English.
| A．admitting | B．admitted |
| C．being admitted | D．to be admitted |
Try to eat food groups _ _ vitamins A, C and E—they will do lots of good to your eyesight.
| A．containing | B．contained |
| C．to contain | D．to be contained |
The discovery of new evidence led to ______.
| A．the thief having caught | B．catch the thief |
| C．the thief being caught | D．the thief to be caught |