~ difficulties
imaginary: existing only in the mind, unreal 想象中的，不真实的 ~ figure
imaginative: of, having, using imagination 有想象力的，运用想象力的 a ~ writer
11) intelligent: having, showing intelligence, clever 有才智的, 聪明的 an ~ looking girl ~ answer
intelligible: clear to mind, that can be easily understood. 易了解的, 易领悟的 an ~ speech/explanation
intellectual: possessing a great deal of knowledge 知识的, 智力的
12) contemptible: deserving contempt 可卑的
a ~ lie
contemptuous: showing contempt 表示轻视的
a ~ look
13) credible: that can be believed 可信的， 可靠的
a ~ witness
credulous: too ready to believe things. 轻易相信的，易上当的
He always cheats ~ people.
creditable: that brings credit. 可称赞的
a ~ record/deed/effort
14) alternate: changing by turns 轮流的， 交替的
alternative: giving a choice between two things 选择的，两者选一的
15) comparable 可比较的， 有类似之处的
comparative 比较而言的， 相当的
There is no scenery comparable to that of the West lake.