tìm lỗi sai và sửa
If people use solar energy, the Earth would become greener.
A. If | B. solar energy | C. the | D. would become |
My father ________ big footprints because he went to work by cars. But now, he walks to work.
A. used to have | B. is used to having | C. didn’t use to have | D. isn’t used to having |