1．(2017·全国卷Ⅰ，67)Fast food ________ (be) full of fat and salt; by eating more fast food people will get more salt and fat than they need in their diet.
答案：is fast food “快餐”，表示一类食物，为不可数名词，谓语动词用单数形式。
2．(2017·江苏高考，24)The publication of Great Expectations, which ________ (be) both widely reviewed and highly praised, strengthened Dickens' status as a leading novelist.
答案：was 关系代词which指代的是先行词Great Expectations，是一本书，再根据strengthened可知需用一般过去时。
3．(2016·全国卷Ⅱ，63)Leaving the less important things until tomorrow ________ (be) often acceptable.
答案：is 本句中动名词短语作主语谓语动词用单数，且此处描述作者的观点，应用一般现在时。
4．(2016·全国卷Ⅲ，69)Confucius believed knives would remind people of killings and ________ (be) too violent for use at the table.
答案：were believed后跟一个宾语从句，and连接了两个并列的谓语，主语knives是复数概念，根据时态一致的原则，这里用一般过去时，故填were。
5．(2015·江苏高考，30)The real reason why prices ________ and still are, too high is complex, and no short discussion can satisfactorily explain this problem.
答案：were 根据句中的“and still are(现在仍然是)”可以得知过去也是一样的情形，故用were。
6．(2017·全国卷Ⅰ，短文改错)In the summer holiday following my eighteen birthday, I took driving lessons.
_____________________________________________________ 答案：eighteen→eighteenth 表示“第十八个生日”应用序数词。
一、数词 (一)基数词的用法
1．基数词在句中可作主语、宾语、定语、同位语和表语。 Three of us have been to Guangzhou. I'd like two sweaters for my daughter. The desk is for you two. —How old are you? —I'm twelve.
2．基数词表示具体数目时，hundred, thousand, million用单数。在表示“数百”“数千”“数百万”等不确定数目时，在hundreds, thousands, millions后接“of＋名词复数”。
The Great Wall is over six thousand kilometers long.
Those mountains are thousands of metres high.
3．表示“几十”的基数词的复数形式，可用来表示某人的岁数或年代。
He went to the United States in his twenties.
4．“基数词＋名词”构成的合成形容词作定语，其中的名词用单数。
two-month holiday两个月的假 (二)序数词的用法
1．序数词前要加定冠词the, 在句中作定语放在被修饰的名词前。 The second lesson is more difficult than the first.
2．序数词前加不定冠词a/an，表示“再一，又一”的意思。 He cast it a third time, and drew in a lot of stones.
3．给东西编号时，序号在前用序数词，序号在后用基数词。 The Fifth Lesson, Lesson Five 第五课 No. 14 middle school 十四中
注意：房间号码和电话号码要一个一个分别读。 Room 203 (读作room two o three) 754662(读作seven five four double six two) 4．分数表示法
分子用基数词，分母用序数词。分子是1时，分母用单数；分子大于1时，分母用复数。
1
fourth或a quarter 4one-3
fourths 4three-1
2a half或one half 2
fifths 5two-1
15one and one-fifth (三)年份、日期、时刻读法 1．年份 四位数通常分两组来读 1996读作nineteen ninety-six
1905读作nineteen o five或nineteen and five 2000读作two thousand 2．日期用序数词表示 July 3rd读作July the third
November 25th读作November the twenty-fifth December 1st读作December the first 世纪也用序数词表示：the 20th century 3．时刻
时刻有两种读法：一是直接读数字，先说钟点数，后说分钟数； 二是先说分钟数，后说钟点数。用介词past表示几点过几分(不超过半小时)或用to表示几点差几分(超过半小时，还差多少分钟到下一个钟点)。