1. Last year they went to the Disney in Hong Kong. They had a good time
there.（合为一句）
   Last year they went to the Disney in Hong Kong ____they had a good time.
2. Why don't you take a bus to go there?（同义句转换）
                       take a bus to go there?
3. The old man is too old to travel around.（同义句转换）
    The old man is       old       he can't travel around.
4. I don't know where to visit next.（改为复合句）
    I don't know____ I should        next.
5. Betty likes taking a bus to work. She likes taking an underground to work better.（合并为一句）
  Betty____taking an underground         taking a bus to work.