LUYEN DOC DIEN CAU TRUC CAU

Oil will not last forever. (1) ____people can use instead of oil - the sun. (A. However, there are other resources ---B. As a result, there is another resource ---C. Moreover, there is another resource ---D. In addition, another resource)

In fact, engineers are now building a new city (2) _______. (A. which use mostly solar energy for its power--- B. that uses mostly solar energy for its power------ C. use most solar energy for their power )

The shade from the houses (3) __(A. helps keep the streets cool----B. keeps helping the streets cool----C. keeps the streets helped to be cool----D. helps and keeps the streets cool)

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