I’m sure cars ________ by solar energy will be popular in the near future.
We shall never forget the days ________ we spent playing happily together.
______ is said, the Yeti is a large, hairy animal that walks on two feet like a human being.
It is thought that Zheng He, a Chinese in the Ming Dynasty, may have been the first person who _____________America from the East. A set out toB. set about to C. set sail to D. set sail for
I don’t care ____ or not you like the plan.
The old couple looked at the plane with their son on it until it was ______.