1. Work hard and you will pass the exam. (用if改写)
    ______ you ______ work hard, you ______ ______ this exam.
2. I don't know where I should visit. (同义句)
    I don't know                                                    .
3. She could speak English at the age of five. (同义句)
    She ______ ______ ______ ______ English at the age of five.
4. The baby panda weighs about 100g. (对划线部分提问)
    ______ ______ ______ the baby panda ______?
5. Skiing is interesting. Diving is interesting, too. (合并为一句)
    Skiing                                                 diving.

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.