4a 部分答案
1. put off 2. call up 3. come up with, cheer up 4. put up,hand out;give out
4b 部分答案
<1>to make <2>to do <3>to help <4>to spend <5>to visit <6>to move
4c 部分答案
1. at the food bank and help to give out food to the homeless people
2. to ask him an important question
3. to paint the house for a few hours tomorrow
4. to visit my grandparents in Hunan
5. not to do that because I am too young and it is not safe
(答案仅供参考 )