() 3. Let me a sunflower.

A.plants
B.plant
C.planting

B

let的固定用法为let sb do sth，后面接动词原形，A是动词第三人称单数，C是动名词，只有B是动词原形，故选B。

() 4. Can you help clean the room?
A. I
B. my
C. me
() 5. We can the chickens on the farm.
A. water
B. feed
C. milk

4.C 5.B

第4题中，动词help后需接人称代词宾格作宾语，A选项I是主格，B选项my是形容词性物主代词，C选项me是宾格，故选C；第5题考查动词词义辨析，A选项water意为“浇水”，B选项feed意为“喂养”，C选项milk意为“挤奶”，feed the chickens是固定搭配“喂鸡”，符合语境，故选B。

Ⅳ.（★★★）读一读Lucy种植萝卜的过程，补全对话吧。
Mum: What are you doing, Lucy?
Lucy: 1.
Mum: Why?
Lucy: I want to plant radish（小萝卜）seeds in the garden!
(One week later)
Mum: Are your radish seeds growing?
Lucy: 2. Small green shoots come out. I'm so happy!
(Two weeks later)
Mum: Look! 3.
Lucy: I water them every day.
(One month later)
Lucy: Mum, 4. I pull up a radish. It's red and round!
Mum: Well done! 5.

1.B 2.A 3.D 4.E 5.C

根据对话语境，1处妈妈询问Lucy正在做什么，对应回答正在做的事，选B；2处妈妈询问萝卜种子是否在生长，对应肯定回答，选A；3处两周后妈妈让看植物的变化，对应植物长更多叶子的表述，选D；4处Lucy叫妈妈来看成果，对应邀请语，选E；5处妈妈总结种植的要点，对应种植物需要照顾的表述，选C。