We should try our best to develop ________ alternatives to petrol.
A. active
B. viability
C. viable
D. positive
查看答案
I'm leaving my present position because the _______ of my contract.
A. expiry
B. deadline
C. expire
D. vanish
We have had a meaningful _______ and I believe we are very close to a deal.
A. negotiate
B. negotiator
C. negotiable
D. negotiation
Nine plus three ______ twelve.
A. makes
B. make
C. is making
D. are making
My family as well as I ______ glad to see you.
A.am
B. are
C. is
D.was
微信支付 
支付宝支付