一、从方框中选择适当的词并用其正确形式填空。
heavy agree large amaze complete
1. The blue whale is the animal in the world. It can be as long as 30 metres.
2. The sky suddenly became dark, so we decided to go home early.
3. The animal on land is the African elephant. It can weigh up to 12 tons.
4. My grandma told me the most story about her childhood yesterday.
5. “I with you,” said Tom. “Maths problems are getting harder this term.”

1. largest 2. completely 3. heaviest 4. amazing 5. agree

1. 由“in the world”可知用最高级，large的最高级是largest。
2. 修饰形容词dark用副词，complete的副词形式是completely。
3. 由“on land”及常识可知指最重的动物，heavy的最高级是heaviest。
4. 修饰名词story用形容词，amaze的形容词形式是amazing。
5. 由语境可知用动词agree，主语是I，时态为一般现在时，用原形。

二、用括号内所给词的正确形式填空。
1. The Burj Khalifa Tower is (tall) building in the world.
2. —Which animal runs (fast) in the world?
—The cheetah.
3. Luxembourg is one of (small) countries in Europe by area.
4. The Changjiang River is (long) river in China.
5. Sally is (short) player on the basketball team.

1. the tallest 2. the fastest 3. the smallest 4. the longest 5. the shortest

1. 句中"in the world"表示范围，应用形容词最高级，tall的最高级是tallest，前加定冠词the，故填the tallest。
2. 句中"in the world"表示范围，应用副词最高级，fast的最高级是fastest，前加定冠词the，故填the fastest。
3. "one of + the + 形容词最高级 + 名词复数"表示"最……之一"，small的最高级是smallest，故填the smallest。
4. 句中"in China"表示范围，应用形容词最高级，long的最高级是longest，前加定冠词the，故填the longest。
5. 句中"on the basketball team"表示范围，应用形容词最高级，short的最高级是shortest，前加定冠词the，故填the shortest。