How long does a snake sleep? It ______ for eighteen ______ a day. A. sleep , hour B. sleeps , hours C. slept , hours
You should keep _______ in the reading room.
Don't ______ the window. Listen to me carefully.
Now children, turn to Page _____ and look at the _____ picture in Unit 1.
She often goes to work __________ .
There __________ a sports meeting in our school next week.