14.
(A) break off
(B) approve of
(C) engage in
(D) take over

(A) break (sth) off翻譯：分開, 折斷；（使）斷開；分開, 關係, 絶交；終止（某種關係）, 突然停頓；突然中斷。
(B) approve of中文:贊成
(C) engage in sth翻譯：參加；參與。
(D) take (sth) over翻譯：接手, 接任；接管，接手, 取得控制, 接管，收購（公司）。

Research has proven that weather plays a part in our moods: Warmer temperatures and exposure to sunshine increase positive thinking, whereas儘管；但是 cold, rainy days bring anxiety and fatigue疲憊／虛弱. 

11 , many people believe that bad weather can reduce productivity生產率 and efficiency.

There is, however, a significant重要的；顯著 12between such beliefs and the actual effect of weather on people’s performance at work.

Using empirical以經驗（或實驗）爲依據 data from laboratory experiments 13 observations觀察 of a mid-sized中等大 Japanese bank in real life, researchers find that weather conditions indeed influence a worker’s focus.

When the weather is bad, individuals tend to focus more on their work rather than thinking about activities they could 14outside of work.

But photos showing outdoor activities, such as sailing on a sunny day or walking in the woods, can greatly distract分心，使轉移注意力 workers and thus 15 their productivity生產率.

The findings conclude（以…）結束 that workers are actually most productive生產率 when the weather is lousy糟糕的，差勁—and only if nothing reminds them of good weather.

由句型結構可以判斷空格所在的句子是一個關係子句，修飾前面的先行詞activities，因此空格內的動詞片語必須是能夠搭配activities使用的動詞片語 

engage in從事

(A) 中斷 (B) 批准 (C) 從事 (D) 接管