二、根据首字母提示，完成下列句子。
1. Rubbish m the river dirty. The river is clean now.
2. Tom l in a small town when he was young.
3. We should put the rubbish in the b.
4. Do you know how to k our city clean?
5. A lot of trees are d because there is no rain.
6. Beijing is one of the big c in China.
7. Please wash your d hands before the dinner.

1. made
2. lived
3. bin
4. keep
5. dead
6. cities
7. dirty

1. 根据后半句“现在河水干净”，可知前半句描述过去的状态，“make sth.+形容词”表“使某物处于某种状态”，此处用make的过去式made。
2. 由“when he was young”（他年轻时）可知句子为一般过去时，“live in”表“居住在”，live的过去式为lived。
3. 结合常识，垃圾应放在垃圾桶里，首字母b提示，填bin。
4. “keep sth. clean”是固定搭配，意为“保持某物干净”，how to后接动词原形，故填keep。
5. 由“没有雨水”可知树处于死亡的状态，are后接形容词dead，故填dead。
6. “one of + 可数名词复数”表“……之一”，city的复数形式是cities，故填cities。
7. 结合语境“饭前洗手”，此处指洗脏的手，首字母d提示，填dirty。

三、按要求改写句子。
1. There are some dirty bottles in the lake.(对画线部分提问)
in the lake?
2. The girl put the rubbish in the bin.(改为一般疑问句)
the girl the rubbish in the bin?
3. We should walk to school.(同义句转换)
We should go to school .
4. The mess in the classroom made Mrs Smith angry.(改为否定句)
The mess in the classroom Mrs Smith angry.
5. Nancy wanted to make her mum happy. She did some washing.(合并为一句)
Nancy did some washing her mum happy.

1. What is
2. Did; put
3. on foot
4. didn't make
5. to make

1. 本题考查there be句型的特殊疑问句。画线部分是事物，用what提问，不清楚具体数量时，be动词用is。
2. 本题考查一般过去时的一般疑问句。原句为一般过去时，变一般疑问句需借助助动词Did放句首，谓语动词put变回原形。
3. 本题考查同义句转换。walk to school和go to school on foot为同义表达，意为“步行去上学”。
4. 本题考查一般过去时的否定句。原句为一般过去时，变否定句需借助助动词didn't，谓语动词made变回原形make。
5. 本题考查合并句子。后一句是前一句的目的，用动词不定式to make表目的，说明Nancy洗衣服的目的是让妈妈开心。