I have done well in the exam because of no careless mistakes.—Congratulations! Students can never be _______ careful in exams.

What is the book mainly about? — Well, it _____ a little boy who suffered a lot during the war.

This _____ my brother. ______ is my friend.

Are you coming to Jeff’s party?— I’m not sure. I _____ go to the concert instead.

We couldn’t have picked ______ day for the picnic — it rained nonstop.