By the time he was ten, Edison _________ experiments in chemistry.
The workers will complete the new bridge in ____________.( )
A.two and a half months
B.two months and half
C.two and a half month
Yangjiang,a famous female writer,_____________for about a month so far.( )
A.diedB.has been dead
C.has been died
The summer vacation is coming.I'm looking forward ___________ it.
Me too.( )
A.atB.toC.on
Though Betty and Lily are twins,Betty isn't so ____________ as Lily.( )
A.more outgoingB.most outgoing
C.outgoing
David,look at the man in black over there.Can you tell me ____________?
He is an engineer.( )
A.who is heB.who he is
C.what he does