1. sense   n. 感官；感觉；意义；vt.  感觉
As is well known to all, dogs have a keen sense of smell.
众所周知，狗的嗅觉灵敏。
She has a very poor sense of direction and she often gets lost.
她的方向感极差，经常迷路。
There is no sense in arguing with him; he won’t listen to you.
和他争论没有意义，他是不会听你的。
When he entered the room, he sensed danger.
当他进入房间时，他意识到了有危险。

2．observe    vt. 观察；注意；遵守，服从；庆祝
She carefully observed every detail of their actions.
她很认真地观察了他们动作的每一个细节。
When I entered the meeting room, I observed a letter on the table.
走进会议室时，我注意到桌上有一封信。
They didn’t observe her come in and go upstairs.
他们没有注意到她进屋上楼。
Do observe the traffic rules whenever you cross the road.
不管什么时候过马路，一定要遵守交通规则。
We are going to hold a party for Grandpa this weekend to observe his 70th birthday.
我们打算本周末为爷爷举办个晚会，庆祝他的七十岁生日。

3. sight   n. 视力；看见；视野；风景
I have good/poor sight.
我的视力好/不好。
I was wandering in the street when I suddenly caught sight of a tailor’s shop.
我正在大街上闲逛，突然我看到了一家裁缝店。
At last the famous school came into sight after a twenty minutes’ drive.  
二十分钟的车程后，那所著名的学校终于进入了视野。
Every year thousands of tourists visit Pompeii, Italy to see the famous sights.
每年成千上万的游客参观意大利的庞贝古城，欣赏那儿著名的风景。

4．deserted  adj. 无人居住的；（街道）无人通行的
The murderer hid himself in a deserted house.
那个杀人犯躲在一座废弃的屋子里。
The former street was deserted after a new one was put into use.
新街道投入使用之后，原先的那条街就废弃不用了。
desert   vt. 抛弃，遗弃，背弃；（勇气）离某人而去
n. 沙漠
Whatever happens, one shouldn’t desert his friends and family.
不管发生什么事，一个人都不该抛弃家人，背弃朋友。
His courage deserted him when he was asked to give a speech in public.
当有人要他当众演讲时，他突然没了勇气。
It is a wonderful experience to travel through the desert by camel.
骑坐骆驼穿越沙漠旅行是一次了不起的体验。

5．cover  vt. 盖，掩盖；行过（路程）；报导；读；占地（面积）
n. 盖子；封面
We all know that lies can not cover facts.
我们都知道谎言掩盖不了事实。
He covered many things we didn’t know.
他报导了很多我们不知道的事情。
They stopped for the night after they had covered a distance of two hundred li.
走了两百里之后，他们停下来准备过夜。
How many pages have you covered so far?
到目前为止你已经读了多少页了？
Our school covers an area of two hundred mu.
我们学校占地面积为二百亩。