句型转换。

1. His parents were proud of his great progress Tom had made in English.

    His parents _______ ______ in his great progress Tom had made in English.

2. The thieves admitted that they had stolen a couple of cars in total. 

     The thieves admitted _______ ________ a couple of cars in total.

3. We finally arrived at the tourist attraction because the guide led us.

    We finally arrived at the tourist attraction ______ the guide ______ us.

4. The great performance in the opening ceremony has a deep impression on us.

    The great performance in the opening ceremony______ us _______.

5. Now, as the prices go up, most families don't have enough money to buy what they need in their daily life.

    Now, as the prices go up, most families______ ______ to buy what they need in their daily life.

经纪人缓冲信息不对称的原因有哪些？