Many scientists say that it’s important for us to have ______ food in our diet.
Mrs. Wang found his little son ______ with his toys alone when she arrived home.
Our physics teacher told us that light _______ faster than sound.
She will have a holiday as soon as she _____the work next week.
I want to return the book to Jack, but I can’t find him. He the library . you can find him there.A has been to B has gone to C has left D went to
– I called you yesterday evening, but there was no answer.--Oh, I am sorry. I __________ dinner in my friend’s home.