（ ）10.Both his parents look sad.

（ ）10.Both his parents look sad.
Maybe they ______what's happened to him .
A.knew B.have known C.must know D.will know
（ ）11.He has _______ been to Shanghai ,has he
A.already B.never C.ever D.still
（ ）12.The famous writer _____ one new book in the past two year .
A.is writing B.was writing C.wrote D.has writte
（ ）13.—Our country ______ a lot so far .
—Yes .I hope it will be even ______ .
A.has changed ; well B.changed ; good C.has changed ; better D.changed ; better
（ ）14.Zhao Lan ______already ______in this school for two years .
A.was ; studying B.will ; stud C.has ; studied D.are ;studying
（ ）15.We ______ Xiao Li since she was a little girl .
A.know B.had known C.have known D.knew
（ ）16.Harry Potter is a very nice film .I______ it twice .
A.will see B.have seen C.saw D.see
（ ）17.—______ you ___ your homework yet
—Yes .I _____ it a moment ago .
A.Did ; do ; finished B.Have ; done ; finished
C.Have ; done ; have finished D.will ; do ; finish
（ ）18.—How long have you ____ here
—About two months .
A.been B.gone C.come D.arrived
（ ）19.Miss Green isn't in the office .she______ to the library .
A.has gone B.went C.will go D.has been
（ ）20.My parents ______ Shandong for ten years .
A.have been in B.have been to C.have gone to D.have been