Jack tries his best to learn how to make a vase, in order to         their promise to finish an artwork with her.

After several days of social activities, I decided to       _ on my research on the human behaviors. 

—What is the boy doing?—It's not necessary for you to be ________ about others' business.

I can __________the house being untidy, but I hate it if it’s not clean. 

What a great diversity of notebook computers！It is hard to decide, which do you _______ me?