—Look at those clouds!—Don’t worry. ______ it rains, we’ll still have a great time.
Do you know that Yuan Longping is known as ______ father of hybrid rice (杂交水稻)?
He didn’t come to school yesterday _______ that he was ill.
It was _________ that everyone like to read it.
It was ______ 7:30 that he _________ home yesterday, so his parents were very worried.
Jack told us that his class ________ sixty-four students.