There is a pair of trousers there.Can you see ___?

There is a pair of trousers there.Can you see ___? can't you see there is a pair of glasses on the desk?为什么句首是c there are a pair of trousers.请问用is还是are? ( )This pair of trousers is a little big . Can you show me ( this pair of trousers ( ) dirty,you can't put( )on A.is,it B You can see a girl ___(draw,draws) pictures there. there is a cd shop near my home you can see many d什么kinds of ——You can see Mr.Lee if there is a sign "( )"on the door of ______ you see there _____ a pair of glasses on the desk What can you see when there is a typhoon? There is only you can't see there is a pair of shoes in the locker和there are a pair of s