1.________can cause high blood pressure, heart problem, sleep disturbances, and hearing problems.
A. Water pollution    B. Air pollution    C. Light pollution    D. Noise pollution
2. Video conferencing allows you______meetings with colleagues who are located in different places.
A. held     B. hold     C. to hold    D. holding
3. technique       B.scholar       C.exchange      D. schedule
4. We are trying to________the problems with the steam engine
 A.support     B. solve    C. benefit     D.invent
5. Choose the word that has the main stress placed diffently from the others.
A. unhealthy     B. impartial     C. historic      D. natural
6. Ayers Rock is also one of the top tourist_______in Australia.
A. attract     B. attractively       C. attractions     D.attractive
7. Let's meet at eight o'clock tomorrow. -Sorry, I_____at eight o'clock.
A. am working        B. will be working      C. will work        D. am going to work 
8. Communicating with foreigners is usually difficult because of______.
A. language barriers                            B. Engish barriers
C. barriers language                            D. barrriers English
9___________having two offical languages, Canada has the third largest English-speaking population.
A. Despite          B. Because           C. Due to              D. Even though
10. If I_______you, I_______that car.
A. am/will buy                                    B. were/ would buy
C. was/ bought                                   D. were/ will buy