—Mary knows so much about . earth!—Yes, you know she is only . eight-year-old girl.
On holidays, they prefer to ______ at home rather than ______.
—Could you help me carry this box? It’s too heavy. —__________.
People should __________ from __________ down the trees to protect the earth.
I don’t think you can finish the work in such a short time, __________?
__________ useful advice he has given us!