—Each boy and each girl talking about optional courses(选修课).—Yes! And the each their favorite one!
If you send the best wishes to your mother on Mother’s Day,____will give her a great surprise.
He sat quietly in the room,listening to the rain____the window.
Everyone stood up _____ the hero came into the lecture hall.
So far, the moon is the only one of the heavenly bodies in space ______ reached by manned spaceships.
According to an old proverb, red sky at night often indicates fine weather the next day.