雅思写作常用的语法练习

雅思写作常用的语法练习-广州朗阁雅思培训中心Complete the following sentences by circling the missing words.1 .Science still a cure for cancer.a. doesn’t find c. hasn’t foundb. haven't found d. aren’t finding2. While he_a route to the Indies, Columbus discovered America.a. searched c. had searched forb. was discovering d. was searching for3. Existing reserves of fossil fuel_by 2045.a. have been run out c. is going to be run outb. will have run out d. have run out4. If logging of tropical rainforests continues at the present rate,_a30 per cent increase in atmospheric CO2 by the year 2000.a. there will be c. there would beb. there might have been d. there could not have been5. Only妙investing heavily in value-added exports_如m thepresent trade imbalance.a. the country can emerge c. can the country emergeb. the country might emerge d. the country emerged6. The mystery of the double helix_，the scope for genetic engineeringdramatically increased.a. having solved c. solvingb. having been solved d. solved

广州朗阁雅思培训中心