One of the most important questions they had to consider was ______ of public health.
| A．what | B．this |
| C．that | D．which |
Look at the naughty boy! You ______ have taught him how to behave himself.
| A．must | B．may | C．can | D．should |
Once harm ______ to the environment, it takes years to have the system recovered.
| A．does | B．is done | C．will be done | D．be done |
Staying in a hotel in Shanghai one day costs ____ renting a house in my hometown for a week.
| A．the three times price of | B．three times the price of |
| C．as much as three times | D．as much three times as |
The woman managed to send her three children to universities but ______ came to see her when she was old and seriously ill.
| A．none | B．all | C．neither | D．both |
We regret to hear nearly half of the people in that area still live ______ the poverty line.
| A．under | B．over | C．below | D．above |