用所给单词的适当形式填空 They had a lot of trouble___(get)to the top of

用所给单词的适当形式填空 They had a lot of trouble___(get)to the top of the mountain.
Liu Huan is one of the greatest___(sing)in China.
Most girls are afraid___(go)out at night alone.
We all thought the news was___(amaze).
It's interesting___(have)a picnic in spring.