43.
(A) behold
(B) cope
(C) envelop
(D) develop

Some cope by singing more loudly, some change the timing of their calls to occur when fewer people are driving, others just move to quieter locales.
有些動物通過大聲唱歌來應對，有些動物改變他們的呼叫時間以在開車的人較少時發生，其他動物只是轉移到更安靜的地方。

(A) behold
to see or look at someone or something
看見；注視
The new bridge is an incredible sight to behold.

(B) cope
to deal successfully with a difficult situation
（成功地）對付，應付，處理
It must be really hard to cope with three young children and a job.
It's only been a year since he died - how's she coping?
He had so much pressure on him in his job that eventually he just couldn't cope.

(C) envelop
to cover or surround something completely
覆蓋；包住；圍繞；籠罩
The graveyard looked ghostly, enveloped in mist.

→相似字envelope信封

(D) develop
to (cause something to) grow or change into a more advanced, larger, or stronger form
（使）發展；（使）發育；（使）成長
It became clear that he wasn't developing like all the other little boys.
The fear is that these minor clashes may develop into all-out confrontation.
Over time, their acquaintance developed into a lasting friendship.
This exercise is designed to develop the shoulder and back muscles.
I'm looking for a job which will enable me to develop my skills/talents.
to invent something or bring something into existence
開發；制定
We have to develop a new policy/strategy to deal with the problem.
The company is spending $650 million on developing new products/technology.
to start to happen or exist
發生；出現
Large cracks began to develop in the wall.
If you develop an illness or problem, or if it develops, you start to suffer from it.
患上，患（病）；逐漸形成（疾病或問題）
The study showed that one in twelve women is likely to develop breast cancer.
She's developed some very strange habits lately.
to build houses, factories, etc. on a piece of land
開發，建設
They're planning to develop the whole site into a shopping complex.

資料來源：劍橋辭典