【C9】A．easyB．criticalC．difficultD．tough

The boy is intelligent.A．cleverB．naughtyC．difficultD．active

A．easyB．ableC．likelyD．apparent

【C19】A．easyB．effortlessC．difficultD．formidable

【C5】A．easyB．relaxedC．simpleD．ready

【C15】A．harderB．easierC．more difficultD．more simple

【C11】A．controlledB．standardC．difficultD．dreadful