7,8单元单项选择

—Do you want to buy the chair?—No. I want to buy a bigger one because it may be much ______.

To ______ our eyesight, we’d better relax for a while after reading for a long time.

To keep themselves ______, they sat on the floorand told each other stories into late night.

—I’m proud of our China’s Tiangong Station plan.—Me, too. We have taken another step ______ ourspace dream.

More and more people are used to running in the park early in the morning to ______ the fresh air, which makes them relaxed.