Many scientists believe that robots ______ able to talk like humans in 50years.( )
A.wereB.areC.will beD.have been
Tea ________ by farmers in our hometown.( )
A.is grownB.grewC.grow
Can I use your dictionary,Grace?
Sure.But you return it after class.( )
A.canB.mustC.may
The safety of food has become one of the ________ problems in our daily life.( )
A.importantB.more important
C.most important
In order to make our city more beautiful,we have planted _______ trees these years in Yiyang.( )
A.three thousandsB.thousand of
C.thousands of
Are these _________ new trousers?
No,they are not _________.( )
A.your,myB.your,mineC.yours,mine