1．My friend was not used______by air，so he felt unwell.
A．to traveling B．to travel
C．traveling D．travel
解析be used to doing “习惯于做某事”。句意：我朋友不习惯乘飞机旅行，因此感觉不舒服。
答案A
2．She is shy.She is not used to______in front of others.
A．praise B．praising
C．being praised D．be praised
解析考查be used to doing “习惯于做某事”。句意：她很腼腆，不习惯当着别人的面受表扬。主语she和praise之间是被动关系，因此C项正确。
答案C
3．The doctor recommended that you ______ swim after eating a large meal.
A．wouldn’t B．couldn’t
C．needn’t D．shouldn’t
解析句意：医生建议说在吃过饱饭后不要游泳。recommend作“建议”讲，后面的宾语从句用虚拟语气，谓语动词为“should(not)＋动词原形”。
答案D
