Ⅰ.单句语法填空
1．When I got up early the next day，I found the air on the hill good ______ (breathe)．
【答案】 to breathe
2．The president of the Royal Society recommended the system of selecting Nobel Prize winners ______ (not change)．
【答案】 (should) not be changed
3．If you want to be popular，above all，join in our class activities and make a contribution ______ our class if possible.
【答案】 to
4．The beggar has no money with ______ to buy food.However，no passersby have mercy ______ him.
【答案】 which；on
5．Mr.Collins undertook ______ (look) after the children while his wife could go to the fit club with two of her friends.
