1.No one except my porents ____ anything about it.
A.know B.knows C.is knowing D.have known
2.His“selected poems”____ tired pubilshed in 1965.
A.were B.was C.has been D.are
3.The air in big cities ____ very dirty by factories.
A.are often made B.is often made C.have often made D.has often made
4.____ can be done ____ been done.
A.All,have B.All that,have C.All,has D.All that,has
5.Your trouser ____ dirty,you must have ____ washed.
A.is,it B.are,it C.are,them D.is,theem