根据句意，用括号中所给单词的适当形式填空。
In summer,it often rains(heavy) with strong wind in Southern China.
表示“雨下得很大”要用heavily来修饰rains。
The physics problem is ______. I can't work out ______.
根据本题语境可知，题干意思：这道物理题目很难，我不能很容易地就把它解答出来。
It's the old man's dream to go to Beijing. Can his dream ______?
go out出去；eat out出去吃饭；come true实现；come on赶快。句意：去北京是那位老人的梦想。他的梦想能够实现吗？根据句意和四个选项的含义可知，come true符合题意。故选C。