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take over接收, 接管
例句：The teacher consented to my urgings and let me take over the genome project.
老师答应了我的要求，让我接管这个基因组项目。
2. The arrests were part of a ten-year investigation which uncovered illegal activity ranging from money laundering to kidney trafficking, in the US, Israel and Switzerland.
range from to从……到……相当于vary from to
例句：Conditions vary from one country to another.
各国的实际情况是不相同的。
3.The official who spoke on condition of anonymity said agents were 85% certain that Sa'ad Bin Laden was killed by chance in an attack by a drone, although he had not been specifically targeted and was not a senior al-Qaeda figure.
by chance偶然, 也许
例句：Although we have only met by chance, I find we have a lot in common.
我们虽然萍水相逢，可是我觉得你和我很谈得来。
4.The French Prime Minister Francois Fillon has criticized the army after tracer bullets fired in the military base set off a huge fire in the countryside near Marseilles of southeast.
set off引起，引发
例句：This question set off a fierce debate.
就这个问题掀起了一场激烈的辩论。