请补充下列单词。documen__ry adj.文件的;文档的
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请补充下列单词。c___ghv.咳嗽
A. ae
B. au
C. ou
D. or
请补充下列单词。dis____sen.疾病
A. ee
B. ea
C. ie
D. ia
It is more____to go by bus than by taxi in Beijing.
A. economics
B. economy
C. ecnomic
D. economical
How much tension can this piece of paper____?
A. durable
B. duration
C. during
D. endure