（ ）1.I think _____necessary for us _____the birds. A.it； perfect B.its ；to perfect C.it’s ；protecting D.it； to protect （ ）2.We must try our best to stop the pollution______a happy life. A. to live B.from living C.living D.live （ ）3.He____the importance of their visit ____the small town. A.don’t understand；to B. doesn’t understand；at C.doesn’t understand ； to D.didn’t understand ； to （ ）4.Some students are playing ____on the playground while the rest _____doing their homework in the classroom. A.happy ； are B. happy ；is C.happily ；are D. happily；is （ ）5.Tomorrow we’ll use dictionaries ,so please ______yours here. A.take B.get C.bring D.carry.