Is this research center ________ you visited the modern equipment last year?
____hard ,and you will make greater progress.
There was a time_____we went to the country and stayed with the farmers there.
.---I’m going to the States for further study. ---How long ____ you ___there?
. I, who, ________your classmate, will support you forever.
--- Are your parents doctors, too? --- No, they are teachers. of them loves teaching very much.