一、单句填空
1.(2015浙江,6)If you swim in a river or lake,be sure to investigate is below the water surface.Often there are rocks or branches hidden in the water.
2.(2015重庆,8)We must find out Karl is coming,so we can book a room for him.
3.(2015福建,29)—I wonder Mary has kept her figure after all these years.
—By working out every day.
