Guinea pigs are intelligent and quiet animals. They may develop a close bond with you and may reward you with chirps, purrs, squ

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问题         Guinea pigs are intelligent and quiet animals. They may develop a close bond with you and may reward you with chirps, purrs, squeaks or whistles. Guinea pigs do not【B1】__________very much if you do not spend much time with them. However, if you spend time with them, they will become more responsive towards you.
        Guinea pigs are very active and they enjoy running through【B2】__________(tunnel) and mazes. If you give them a toy, they will play with it.【B3】__________you have more than one guinea pig, you may observe that they like to play games of chase with each other. Guinea pigs are social animals. They like to interact with others. However, be【B4】__________(carefully) not to overcrowd their homes. This is because it is very stressful for them and they may attack each other. Do not change their food or environment as they do not like changes.
        So still interested in having a guinea pig as a pet? Just remember to【B5】__________note of the above points.
【B4】

选项

答案careful

解析 be 动词后面用形容词形式。“be careful to”意为“小心做……”。
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