9. Keeping pets can waste a lot of energy.
養寵物要花費很多精力。
還能這樣說：
You need to spend a lot of energy to keep pets.
A lot of energy is needed to keep pets.
諺語：
Waste not, want not.
儉以防匱。
10. You should look after your pets and not disturb others.
你應該看管好自己的寵物，不要影響到其他人。
還能這樣說：
Your pets should be carefully watched and are not allowed to disturb others.
In order to avoid disturbing others, you should attend to your pets.
應用解析：
disturb the peace 擾亂治安
11. I hate pets in my community.
我討厭我們小區的寵物。
還能這樣說：
Pets in the community are my nuisance.
I don't like pets in my community.
諺語：
A pet lamb makes a cross ram.
寵壞的小羊將成為脾氣壞的大羊。
12. My dog is ailing.
我的狗生病了。
還能這樣說：
My dog has fallen ill.
My dog is sick.
應用解析：
a gay dog 一個快樂的人；
dog sb.'s steps 跟蹤某人；
sick as a dog 病得厲害