1.The ice is thick enough_____
问题描述：
1.The ice is thick enough_____
A.to walk on B.for walking C.to wale D.to walk on it
2.She often comes to visit us without____whether we are ftee or not.
A.asked B.asking C.to ask D.ask
3.The room is so dirty that is needs ____badly.
A.clean B.to clean C.beimg clean D.cleaning
4.The patient is going to have his tooth_____.
A.pull out B.to pull out C.pulled out D.pulling
答
1.D enough to do sth 是固定搭配
2.B without是介词,后接名词.
3.B need 后接to do
4.D 牙齿是被拔,所以用过去分词,表被动.