根据各小题Ａ句的意思完成Ｂ句，使两句的意思基本相同。每空限填一个单词。
A: His friend didn't know what he should do.
B: His friend didn't know      do.
A: What was wrong with the old man？
B: What             the old man？
A: He found it was not easy to sleep.
B: He found       to sleep.
A: He went to bed at twelve last night.
B: He go to bed twelve last night
A: She was worried and her friend was worried, too.
B: She was worried and            her friend.
A: She always makes me happier when I’m unhappy.
B: She always      me    when I’m unhappy.