一、阅读短文，在空白处填入一个恰当的单词或用括号内所给单词的适当形式填空。

Do you know the meanings of these signs? Signs are very important in 1. ( we ) daily lives. We can often see them in different places. The first sign tells us not to drive too 2. ( quick ). The 3. ( two ) sign means that we mustn't turn left, 4. we can turn right. If we see the third sign in 5. shop, we know that it 6. ( open ) from Monday to Friday. The fourth sign can be seen in a museum. It means "No 7. ( photo )." So we mustn't 8. ( take ) photos there. We must keep quiet 9. we see the last sign, or people will not be pleased (高兴). Be careful to remember the signs. It's good 10. us.

1. our 2. quickly 3. second 4. but 5. the/a 6. opens 7. photos 8. take 9. when/if 10. for