759.simple(形)单纯的、简单的
Such a toy is simple to make.这种玩具做起来很简单。

760.since(介)自……以来、从……至今
I haven't heard from him since last year.我自去年以来未曾听到他的消息。

761.sing(动)唱、歌唱
不规则变化sang, sung
She sang to the guitar.她和着吉他歌唱。

762.singer(名)歌手
His mother was an opera singer.他的母亲是一位歌剧演唱家。

763.sir(名)先生、阁下
This way, sir.先生，这边请。

764.sister(名)姊;妹
She is elder sister to Susan.她是苏珊的姐姐。

765.sit(动)坐
不规则sat, sat
They sat in a ring，他们坐成了一圈。

766. six(形)六的、六个的
I work six days every week.我每星期工作六天。

767.sixteen(名)十六、十六岁
She is a young woman of sixteen,她是一个十六岁的少女。

768.sixth(名)第六、第六个
He is the sixth to arrive.他是第六个到的。

769.sixty(形)六十的
Sixty persons are working there.有六十个人在那工作。

770.size(名)大小、尺寸
What's the size of the park?这个公园有多大?

771.shirt(名)裙子(动)位于……之边缘
(名):The little girl was dressed in a very short skirt.小女孩穿了一条很短的裙子。
(动):The boys shirted the field so as not to damage the crops.为了不损坏庄稼，孩子们绕着田边走。

772.sky(名)天空
There were no clouds in the sky.万里无云。

773.sleep(名)睡眠(动)睡着
不规则变化slept, Slept
(名):It seems that you haven't got enough sleep.看来你睡眠不足。
(动):He was still sleeping when I went in.我走进去时他还在睡觉。

774.slow(形)缓慢的
反义词fast
He's a slow walker.他走起路来慢吞吞的。

775.small(形)小的；少的
反义词big
My bedroom is smaller than yours.我的卧室比你的小。

776.smart(形)精明的、聪敏的
反义词stupid
He is smart and can take care of himself.他很精明可以照顾自己。

777.smell(名)嗅觉(动)嗅出
(名):Dogs have a very good sense of smell.狗的噢觉很灵敏。
(动):I can small something burning.我闻到有烧焦的气味。

778.smile(名)微笑、笑容(动)微笑
(名):She welcomed him with a smile.她笑着表示欢迎他。
(动):What are you smiling at?你笑什么？

779.smoke(名)烟(动)冒烟；抽烟
(名):She can't stand the smell of tobacco smoke.她受不了香烟的气味。
(动):A chimney could be seen smoking in the distance.看得见远处的烟囱在冒烟。

780.snack(名)点心、小吃
He ate a snack in the morning.他早士上吃了一份点心。

781.snake(名)蛇
The child was frightened by the snake.这小孩被蛇吓了一跳。

782.snow(名)雪(动)降雪
(名):A beggar was lying dead in the snow.一个过世的乞丐躺在雪地里。
(动)It has snowed for three days running.已接连下了三天的雪。

783.so(副)至某种程度、如此
I'm so pleased to see you.看到你我真高兴。

784.sock(名)短袜
惯用复数
He was five feet in his socks.他穿着袜子身高为五英尺。

785.sofa(名)沙发
Please sit on the sofa.请坐在沙发上。

786.some(形)少许、一些、某些
I have some work to do this evening.今晚我有事要做。

787.someone(代)有人、某人
同义词somebody
Someone left this for you.有人把这留给你。

788.something(代)某事、某物
I have something to ask you.我有事情要问你。

789.sometimes(副)有时
Tom comes to visit us sometimes.汤姆有时来看我们。

790.somewhere(副)在某处；大约、大概
Can you put her up somewhere tonight?你能不能给她个晚上住的地方？

791.son(名)儿子
反义词daughter
Mike was the third of five sons.在五个儿子中麦克排行老三。

792.song(名)歌
He likes popular songs.他喜欢流行歌曲。

793.soon(副)不久、马上
It will soon be Christmas.圣诞节很快就要到了。

794.sorry(形)难过得、惋惜的、抱歉的
We're sorry to be late.对不起，我们来迟了。