【keep a promise,get back from,is able to,write down,take up】

题目

【keep a promise,get back from,is able to,write down,take up】
1.i will call you when i __ Tianjing
2.She is very clever .She is __ work out the math problem easily
3.Should I __ every word that everyone says?
4.It is easier to __ than to keep a promise
5.I'd be happy to __ a new hobby

答案

get back from able to write down keep a promise tack up 第四题题目是对的么?