The reason why she couldn’t come to the meeting was_____ she had not been invited.
It’s quite impossible that it will rain tomorrow. But if it _______, I would still go to the park.
_____ scores of times, but he still couldn’t understand it.
--- He was nearly killed by a car once. --- Oh. when was________ exactly? --- It was in 2002 __________ he was riding a bike on the drive-way.
The students expect there ______ more reviewing classes before the final exam.
______ the secret of nature, the young scientist has little time for entertainment.