1 . 根据句意需要选择合适的词或短语将句子补充完整。

recommended       masters       competed        exchange        suffered

1. In history class we can __________opinions freely.
2. My advisor ___________that I should sign up for advanced literature because I like English and I’m good at it.
3. They must be athletes who are___________ in their sports and also set good examples for others.
4. How many countries ___________ in the 30th Olympic Games?
5. He __________ many difficulties before he won a silver medal.