The old couple looked at the plane with their son on it until it was ______.

New technology was used in teaching. As a result, not only ______, but students became more interested in the lessons.

The weather in Beijing is different from_______ in Suzhou.

Who would you like to see you off at theairport— .Just say “good-bye” at home.

The students look very tired after the sports meeting.—We’d better make them ____a rest in the classroom.