help!!! gấp lắm 7. .riding a bicycle is good leg exercise, it does not use up a lot of calories. A. As B. although C. Because D. So that 8. .......................the cities do not provide better and cheaper mass transport, the traffic problem will get worse. A. So that B. Even though C. If D. Before 9. ..you go to Canada, you should visit Toronto. A. When B. As C. Since D. Unless 10. ............towards the shore, its shape is changed by its collision with the shallow sea bottom. A. That a wave rolls B. As a wave rolls C. A wave rolls D. A waves rolling 11. Steamboats did not replace sailing vessels on the high seas..later in the 1860s. A. until B. although C. because D. Unless 12. The stimulation that infant animals receive affects their behavior..they become adults. A. during B. since C. because D. When 13. is toasted, the brown on the outer surface consists of dextrin, which is easier to digest than starch. A. Because of a slice of bread B. Although a slice of bread C. When a slice of bread D. While a slice of bread. 14. Conifers are important to manthey supply much of his lumber and most of the wood pulp for paper. A. whereas B. although C. whenever D. Because