用所给词的适当形式填空。

1. I enjoy _             (swim) in the river.    

2. The best way of learning English is by               (use) it.      

3. A good language                (learn) should have lots of practice.      

4. When I hear the _            (exciting) news, we all got _             (excite).      

5. His father was very _             (frustrating) because he was always for school.

十三五”规划建议在第七部分第六条“建立更加公平更可持续的社会保障制度”中提出，实施全民参保计划，基本实现法定人员全覆盖。将（）合并实施。

A.养老保险和工伤保险

B.生育保险和基本医疗保险

C.养老保险和生育保险

D.工伤保险和基本医疗保险