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 regrettableC regretting D regretted

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