____ the plan has been made , let’s get down to ____ it out .
—Do you think George has passed the driving test? —No. If so, he ________ his car to our college yesterday.
(2013·全国Ⅱ,6)Since nobody gave him any help, he ________ have done the research on his own.
—You needn't take an umbrella.It isn't going to rain. —Well, I don't know.It ________ do.
When I was a child, I ________ watch TV whenever I wanted to.
I should not have laughed if I ________ you were serious.