Maria has to baby-sit.That’s___ she can’t come out with us.
The Party calls on every teacher to learn from Zhang Lili,the most beautiful teacher in China, and try to be Zhang Lili.
—Why are you late again?—Something happened to our friend Wang Fei. I _____ to help him.
The American’s long-time painful work finally , for he broke the Guinness World Record for Hula-hoop Spinning(转呼啦圈).
it rain tomorrow, we would have to call off the hike.
—Did you tell your parents about the result?—Oh, no, I forgot. I them now.