Cars play an important role in modern life , but they also cause many problems like air pollution.
| A．should | B．can | C．must | D．will |
Having paid off all their ____, the Smiths are now ____ financial problems.
| A．debts; free of | B．money; free of | C．debts; free from | D．money; free for |
—How much of the foreign expert’s speech have you understood?
—Next to nothing. I wish I _______ harder at English.
| A．worked | B．had worked | C．would work | D．were working |
The Expo site should be _______ from anywhere in the city of Shanghai within 90 minutes by bus, subways and special taxis.
| A．adoptable | B．acceptable | C．available | D．accessible |
--- Where did you meet him for the first time?
--- Maybe it is in the museum ______ we listened to the lecture ______ we got to know each other.
| A．that; that | B．where; that | C．which; that | D．that; which |
We work together to achieve our common purpose： ______ world that is safer, cleaner and healthier than______ one we found．
| A．the；the | B．a；不填 | C．a；the | D．the；不填 |