用“have,has,had,there is,there are,there was,there were”填空.

用“have,has,had,there is,there are,there was,there were”填空.
10) How many students ______in the classroom?11) ______a story-book on the table a moment ago.12) What do you ______?13) My parents ______ some nice pictures.14) ______ some maps on the wall.15) ______ a map of the world on the wall.16) David’s friends ______ some tents.17) __________ many children on the hill.