Today the forests are getting fewer and fewer. We must ______ down too many trees.
______ it rained heavily this morning, nobody in our class missed the lesson.
—It’s reported that doing eye exercises is no use for students. But I hear you have to do it every day.—You’re right. But it’s one of the _______ in my school.
—The doctor told me not to drink too much but I find it difficult.—The doctor is right. _____ you drink, ______ you will be.
That old woman lives alone. But she refuses others’ help and does everything by ______.
—What’s the radio saying, Jack?—Oh, ______ meteorolite(陨石) attacked _______ earth and it fell down in Russia on February 15, 2013.