2) fall down强调的是“滑倒、倒下”，后接宾语时应加上介词from。

The boy hit the tree to hard that he fell down.

3) fall off强调的是“跌落、从……掉下来”，后直接接宾语，相当于fall down from

The girl is falling off the bike. (= The girl is falling down from the bike.)

(3) hold on(to sb. / sth.) 抓紧，不放开(某人或某物)

7、However, the next day, I only fell over a few times, and I managed to do a few rapid runs. 然而，第二天，我只跌倒了几次，我设法做一些快速地滑行。

a few 和few 修饰可数名词复数，a few 表示有几个，few表示几乎没有;而a little和little 后接不可数名词。

8、Although it was very cold, I spent most of my holiday skiing.

(1) although/ though连词，意为“虽然，尽管”，引导让步状语从句.

(2) 辨析：spend; take; cost and pay

1) spend的主语必须是人， 常用于以下结构： spend time /money on sth. 或spend time / money (in) doing sth.

I spent two hours on this maths problem.

They spent two years (in) building this bridge.

2) cost的主语是物或某种活动， 常见用法如下： sth. costs (sb.) +金钱,某物花了(某人)多少钱;或者 (doing) sth. costs (sb.) +时间,某物(做某事)花了(某人)多少时间

A new computer costs a lot of money.

Remembering these new words cost him a lot of time.

3) take 的主语时it， 常见用法有It takes sb. +时间+to do sth. 做某事花了某人多少时间。

It took them three years to build this road.

4) pay的基本用法是： pay (sb.) money for sth. 付钱(给某人)买„„;或者pay for sth. 付„„的钱。

I have to pay them 20 pounds for this room each month.

I have to pay for the book lost.

pay for sb. 替某人付钱 pay sb. 付钱给某人

pay money back 还钱 pay off one's money还清钱

9、The group had to wait unit after 12 to check in at the hotel.

until 直到…… not… until… 直到……才……

I’ll wait for you until you come.

I didn’t go to bed until my parents came back home last night.

10、In 1942, Columbus discovered American.

辨析：discover; find and invent

1) find：意为“找到，发现”。既可指经过寻找后得到或重新获得已失去的东西，强调动作的结果。

At last,I found my dog under my bed.

2) invent 指通过想象、研究、劳动而创造前所未有的东西。

Can you tell me who invented the telephone?

3) discover：指发现本来存在，但以前未为人知或未被发现的事物、真理或情况。

Columbus is the first European who discovered America.

11、full of fun 充满乐趣