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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。
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)
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。
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)
答案
1. talking 2. keep on
解析
本题考查固定结构keep on doing sth的用法，该结构意为“继续做；反复做”，介词on后面需要接动词的-ing形式；同时Let's后要接动词原形。第1小题中keep on后需填入所给动词talk的动名词形式；第2小题根据中文提示“继续”以及后面的doing，结合Let's后接动词原形的规则，填入短语keep on即可。
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)
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)
答案
1. to bring
2. Make sure (that)
2. Make sure (that)
解析
1. 根据make sure的用法规则，其后可接动词不定式构成make sure to do sth. 结构，意为“确保/务必做某事”，此处需要使用提示词bring的不定式形式。
2. 空格后是完整的陈述句作宾语，符合make sure后接that引导的宾语从句的用法，该句为祈使句，开头用动词原形，引导词that可省略。
2. 空格后是完整的陈述句作宾语，符合make sure后接that引导的宾语从句的用法，该句为祈使句，开头用动词原形，引导词that可省略。
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(污染). (we)
3. If you , your dream will come true. (尽你最大的努力)
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(污染). (we)
3. If you , your dream will come true. (尽你最大的努力)
答案
1. to work
2. our
3. try your best
2. our
3. try your best
解析
本题考查try one's best的固定用法：
1. 根据固定结构try one's best to do sth.（尽最大努力做某事），此处需要填入所给动词work的不定式形式。
2. 固定搭配try one's best中的one's要使用和主语对应的形容词性物主代词，本句主语是We，对应的形容词性物主代词为our。
3. 要表达“尽你最大的努力”，套用短语try one's best，主语为you，对应的one's是your，if引导的条件状语从句用一般现在时，直接填入对应表达即可。
1. 根据固定结构try one's best to do sth.（尽最大努力做某事），此处需要填入所给动词work的不定式形式。
2. 固定搭配try one's best中的one's要使用和主语对应的形容词性物主代词，本句主语是We，对应的形容词性物主代词为our。
3. 要表达“尽你最大的努力”，套用短语try one's best，主语为you，对应的one's是your，if引导的条件状语从句用一般现在时，直接填入对应表达即可。
() 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
A.think of
B.make sure
C.find out
D.take care
答案
B
解析
辨析四个选项短语含义：A. think of 意为想到、考虑；B. make sure 意为确保、保证；C. find out 意为查明、弄清楚；D. take care 意为小心、当心。代入句意“仔细规划你的时间，______你每天都有时间做自己喜欢的事”，只有B项语义通顺符合语境。
() 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
A.fireman
B.scientist
C.lawyer
D.director
答案
B
解析
根据前半句“Robert对科学很感兴趣”的语境，A消防员、C律师、D导演都不符合和科学对应的职业要求，只有B科学家符合语境逻辑。
() 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
—My mother's birthday is coming soon. I a gift for my mum.
A.buy
B.buying
C.bought
D.am going to buy
答案
D
解析
由语境“妈妈的生日即将到来，我正在攒钱”可知，买礼物是计划将要发生的动作，需用一般将来时。A是一般现在时，B不能单独作谓语，C是一般过去时，均不符合语境，am going to buy可表示计划打算做某事，符合题意。
