The infrastructure of a country is makes everything run smoothly，including things like transport， irrigation， electricity，postal service， telephones and schools.

Li Ming speaks very good English _____ he were an English boy.

When the policeman stopped us, we all looked questioningly at him, ?

You didn’t go to the party last night,didyou— I do wish I ___there.

Your desk is crowded with too many unnecessary things,including used papers and books.You’d better __________ some of them.[ ]