The teacher said light much faster than sound.
—Have you heard that Tom,along with his parents,______to Japan? —Really?No wonder I haven’t seen him these days.
As soon as he comes back, I’ll tell him when ______ and see him.
Great changes ______ in my hometown in the past twenty years.
It _____ long before we _____ the result of the experiment.
Mrs. Brown was much disappointed to see the washing machine she had had ____ went wrong again.