1.The political future of the president is now hanging by a __.
A thread
B cord
C string
D rope
2.The question is still__ discussion.
A in
B by
C for
D under
3.We managed to reach the top of the mountain, and half an hour later we began to __.
A ascend
B descend
C decline
D plunge
4.To survive in the intense trade competition between countries, we must__ the qualities and varieties of products we make to the world-market demand.
A improve
B enhance
C guarantee
D gear
5.There has been a __ lack of communication between the union and the management.
A regretful
B regrettable
C regretting
D regretted