sure
                    - I’m sure I will get good grades (成绩) in this exam.—If so, I believe your parents will ______ the result.
 - We are sure tothe volleyball match this afternoon.
 - Can you help me? — Sure. What would you like me?
 - I’m sure that I’ ll have a good job, and it will _____ me happy.
 - Can I just have a try?-Sure. It doesn’tif you give a wrong answer.
 - Where is Sally?—I’m not sure. Shein the library.
 - I’m sure I much taller in five years.
 - Where’s Lucy?—I’m not sure. She ________ in the school library.
 - Be sure _______ when you enter the cave. Otherwise, you’ll hit your head on the rocks.
 - Make sure all the lights ______ when you leave the room.— OK, I will.