Thetimehascome_____wemakeextensiveuseofnuclearenergy.
A、When
B、while
C、as
D、since
Whoistheman____(你刚才在操场和他握手)?
A、willwe
B、dowe
C、don'twe
D、shallwe
Thecitygovernmenthasdeterminedtoget_____withpeoplewhotrytoescapepayingtaxes.
A、rough
B、tough
C、rigid
D、bold
Youcantakeanyseat____isfree.
A、inwhich
B、that
C、where
D、which