Our future house will be on the ocean. It will be surrounded by tall trees and blue sea. But we only have salt water in the ocean. We need fresh water for (1) _______________ and for growing food (2) _______________ farms. 

Ocean water is too salty (3) _______________. It is also too salty for watering plants. We must have the (4) _______________ to make fresh water from salty water. We should be (5) _______________ not to waste water.  

1. A. drink      B. to drink        C. drinking    D. to drinking  

=> and :  nối 2 từ cùng loại

2. A. on         B. at                 C. in    D. into  

=> Giới từ “On” chỉ địa điểm (farms)

3. A. drink      B. to drink      C. drinking   D. for drink  

=> adj (salty) + to v

4. A. things     B. suggestions  C. ways   D. ideas  

=> Chúng ta phải có cách để làm nước ngọt từ nước mặn.

5. A. careful   B. careless        C. carefully   D. carelessly  

=> tobe + adj