根据句意,选用括号内适当的词填空 1).—How many (chair/chairs) are there in the house? ---There are two. 2).—Are there (any/some) flowers in the room? ---Yes, there are. 3).The ball is (under/behind)the door. 4).I can see a boy (on/in) the tree. 5).There are many trees (in front of/in the front of)the classroom.