—Jack, I have________ working out the math problem.
—Don't worry. Let me help you.
A：fun
B：trouble
C：experience
D：interest
被海水淹没，坡度较缓，陆地向海洋的自然延伸部分是
____×7＝28
8×____＝64
____×8＝24
Why not buy bananas?
