You should be more careful _____ you make mistakes again

Do you think teenagers ____to make their own decisions.— No, I don’t agree with you. They’re too young to do that.

What do you think of your step—mother? ——There are some things that are not easy to______，but on the whole she is a good mother．

Steven is a hard-working boy and he always listens to the teacher ________ in class.

Many teenagers in the USA like baseball. But in China, it is not popular at all. [ _____ students can play it.