The cruelty of the terrorists towards the two Chinese engineers inPakistan and____of the terrorists towards America in September 11 filledeveryone with horror

下列各句中，没有语病的一项是

－Is the math problem ______－Yes， I can work it out ______.

My advice to you is to________alcohol at once and stay away from it forever.

Since then the number of people taking driving lessons ________ 20％