.单项选择。 ( )1.How long _ you _ here? Since I came here five years ago.A.have, studiedB.did, liveC.do, stayD.were, swimming( )2. Dont eat too much candy, for its_ your teeth. Oh, I get it. Thank you.A.harm toB.good for C.badly toD.harmful to( )3.There is _ pollution in the world. We must stop it.A.much tooB.too muchC.many tooD.too many( )4.Is the flower beautiful? Yes, at _ its _ the one you bought for me.A.last
