1.我累了，昨晚我不该打游戏到很晚的。

2.我和海伦不是很熟，不过我们偶尔一起出去吃饭。

3.我们应该到机场去接她。

4.你可以清楚地看到有人快要淹死，而你却没有采取行动救他们。

5.包括周末在内，仅仅还有15天时间可以用来买春节礼物。

6.如果不立即采取行动，许多种野生动物就会因为饥饿而死亡。

7.那首歌总是使她回想起在芝加哥读过的那个晚上。

8.街角处刚巧有一位老人，我便向他问路。

9.由于天气恶劣，今天所有去华盛顿的航班都耽误了。

10.谁有责任谁就必须为一切损失作出赔偿。

译文

1.I am exhausted. I shouldn't have stayed up playing PC games last night.

2.I don't know Helen very well, but we go for an occasional dinner together./but we occasionally have dinner together.

3.We are supposed to pick her up at the airport.

4.You could clearly see people drowning, but you took no action to save them.

5.Including weekends, there are only 15 more days to buy Spring Festival presents.

6.Without immediate actions, many kinds of wild animals would die from hunger.

7.That song always reminded her of the night spent in Chicago.

8.There happened to be an old man on the corner, so I asked him the way.

9.All flights to New York today are delayed because of the terrible/bad weather.

10.Whoever is responsible/Anybody who is responsible will have to pay for the damage.