【C2】A．opportunityB．chanceC．likelyD．occur

A．easyB．ableC．likelyD．apparent

【C16】A．opportunityB．carelessnessC．accidentD．hand

A．betB．chanceC．factD．luck

【C17】A．more possiblyB．less possiblyC．more likelyD．less likely

【C10】A．purposeB．chanceC．occasionD．basis

【C11】A．joyfulB．willingC．likelyD．eager