题目

(2017·天津高考)An assumption behind UK insurance for driverless cars, introduced earlier this year, insists that a human “________ (be) watchful and monitoring the road” at every moment. 答案：(should) be insist表示“坚决要求”讲时，后面的从句要用虚拟语气。19．（-0.6）2015•（$\frac{5}{3}$）2016=-$\frac{5}{3}$．