People should ______ from ______ down the trees to protect the earth.
This is the most beautiful park I have _____ visited.
—When did the Greens come to China?—They_____ China for seven years.
Do you know where_______________?
On my way _______ home, I pass _______a fruit shop every day.
—Do you know if Tom ________to the concert?— I’m not sure, but if he________, I’ll go to the concert with you.