—I’m tired and stressed out.—You should ___________.
The teacher did what he could _____ his students.
He works _____ in English, but he can ____ make progress.
Teachers often tell their students _______ across the road when the traffic light is red.
–Lots of trees and flowers ________ on both sides of the road last year. --Oh, _______ beautiful they are!
–Where is Tom? --He _______ the USA. He _______ back in two months. A. has gone to; comes B. has been to; will be C. has been to; comes D. has gone to; will be