She knows so much about England. She ________ there before.
Americans usually just say“Hi”or“Hello”, _______ a more formal handshake when they first meet you.
The fireman couldn’t __________ what the dark thing was through the heavy smoke.
We are now living in _______ world where computers rule our work and daily life.So online searches have already become _______ must.
What impressed me most in his report lies in the words to bring about an _________ of the conditions of the working men and women.
________ it comes to the increasing use of motor vehicles in the cities,some people think it should be limited.