根据下列句子及所给单词的首字母，在答题纸上按题号写出各单词正确的完全形式（每空限写一词）。

1. Generally speaking, when taken according to the d______, the drug has no side effect.

2. The smile on his face put us at e______ immediately.

3. There is c______ evidence of a link between exposure to sun(日光暴晒) and skin cancer.

4. I r______ to tell you that I am unable to accept your kind invitation.

5. The couple are always a______ with each other about money.

6. The game attracted over 500 competitors r______ 8 different countries.

7. The explorers were told to e______ themselves with everything they would need for the voyage.

8. When we visited my old family home, memory came c______ in.

9. It was w______ that he was caught stealing in a department store.

10. At the meeting they discussed three different a______ to the study of mathematics.