探究点 1 keep on doing sth 的用法
keep on doing sth 意为“继续做；反复做”。
Let's keep on doing our work after an hour's rest.
休息一个小时后,让我们继续工作吧。
[知识拓展]
keep on with sth 表示“继续某事”。
You can keep on with your books and your ideas.
你可以继续看你的书和保持你的想法。
情境应用
1. We kept on until the light was off. (talk)
2. Let's doing our homework after half an hour's rest. (继续)

1. talking
2. keep on

1. 在“We kept on ______ until the light was off.”中，keep on doing sth是固定搭配，意为“继续做；反复做”，talk的动名词形式是talking，所以这里应填talking。
2. 在“Let's ______ doing our homework after half an hour's rest.”中，let's后接动词原形，根据“keep on doing sth 继续做；反复做”以及汉语提示“继续”，这里应填keep on。

探究点 2 make sure 的用法
make sure 意为“确保；保证”,后接 that 宾语从句、of 介词短语或动词不定式。
Make sure that you wear the seat belt.
确保你系好安全带。
Make sure of his coming before you set off.
你出发之前要确定他一定会来。
Make sure to lock the door before you leave the house.
在你离开房子之前,一定要锁上门。
情境应用
1. Make sure your homework here tomorrow. (bring)
2. everything is ready. (确保)

【解析】：
1. 根据题意和所给词“bring”可知，此处应用“make sure to do sth”结构，意为“确保做某事”，所以应填“to bring”。
2. 根据汉语提示“确保”及句子结构，此处应用“make sure”的祈使句形式，即动词原形开头，且位于句首首字母应大写，所以应填“Make sure”。
【答案】：
1. 【答案】：to bring
2. 【答案】：Make sure

探究点 3 try one's best 的用法
try one's best 意为“尽最大努力”,try one's best to do sth 表示“尽最大努力做某事”。
I know it's hard, but I will try my best.
我知道这很困难,但我会尽我最大的努力。
We should try our best to help the people in trouble.
我们应该尽力帮助困境中的人们。
情境应用
1. However difficult it might be, I will try my best it out. (work)
2. We should try best to fight against pollution. (we)
3. If you , your dream will come true. (尽你的最大努力)

1. to work 2. our 3. try your best

1. try one's best to do sth 表示“尽最大努力做某事”，此处用 to work。
2. try one's best 中 one's 需用形容词性物主代词，we 的形容词性物主代词是 our。
3. “尽你的最大努力”译为 try your best，if 引导的条件状语从句用一般现在时，主语是 you，动词用原形。

() 1.Plan your time carefully and ______ you have some time to do what you like every day.
A.think of
B.make sure
C.find out
D.take care

B

本题考查动词短语的意思及语境理解。think of 意为“考虑，想起”；make sure 意为“确保”；find out 意为“查明，弄清楚”；take care 意为“小心，注意”。根据题意“仔细计划你的时间，并____你每天都有一些时间做你喜欢的事”，这里需要表达“确保”的意思，所以选 make sure。

() 2.Robert shows a great interest in science. He wants to be a when he grows up.
A.fireman
B.scientist
C.lawyer
D.director

B

题干提到罗伯特对科学表现出极大的兴趣，根据“shows a great interest in science”可知，他想成为的应是与科学相关的职业。分析各选项：A项表示消防员，与科学无直接关联；B项表示科学家，符合题意；C项表示律师，与科学无关；D项表示导演，也与科学无关。因此，科学家是符合罗伯特兴趣和愿望的职业。

() 3.—What are you saving money for?
—My mother's birthday is coming soon. I ______ a gift for my mum.

A.buy
B.buying
C.bought
D.am going to buy

D

问句询问存钱目的，答句提到妈妈生日即将到来，表明买礼物是计划中的将来动作，用一般将来时"be going to+动词原形"，主语是I，be动词用am，所以选D。