题目内容：

    A group of students at Yale University has set up a drone (无人机) delivery service on campus. Kiki Air_______to deliver candy, snacks and other small items to students who place orders_______an app. The service is being tested_______using a small group of student customers before being launched_______wide. Developers told the Yale Daily News that users_______items from a menu on their phones and receive them at one of several drop_______around campus in a padded envelope _______to a drone.

Kiki Air's founder, Yale senior Jason Lu, says his company_______from a class project and has_______a $150,000 grant(补助金) from a California-based investor in startups. “The convenience store business model hasn't been________in a hundred years,” Co-founder Cat Orman told the student newspaper. “Delivery is ________, inefficient and pays divers terrible wages. We created Kiki Air________we want to bring that model into the future in the ________that creates real jobs and reduces the carbon footprint.” Customers are notified when a drone is________the prearranged drop zone to ensure they are in the area to________a package.

The newspaper reported that a Kiki Air drone________last week onto a campuswalkway, but nobody was________. Oman described the incident as a “controlled landing” and said the company has increased________and will improve the service after the incident. Yale officials didn’t immediately return________left on Monday seeking comment. Company officials say they hope eventually to ________the service to other campuses.

1.A.prefers B.promises C.manages D.demands

2.A.for B.to C.through D.over

3.A.currently B.gradually C.sincerely D.fluently

4.A.nation B.world C.town D.campus

5.A.order B.require C.consult D.accept

6.A.directions B.locations C.environments D.devices

7.A.carried B.added C.attached D.accessed

8.A.grew B.dated C.benefited D.differed

9.A.raised B.gained C.saved D.donated

10.A.updated B.discovered C.operated D.explained

11.A.convenient B.necessary C.unpopular D.expensive

12.A.when B.if C.because D.though

13.A.way B.result C.case D.event

14.A.finding B.leaving C.nearing D.locating

15.A.do up B.pick up C.give out D.put out

16.A.stopped B.landed C.arrived D.fell

17.A.warned B.affected C.injured D.punished

18.A.delivering B.flying C.controlling D.training

19.A.items B.messages C.service D.drone

20.A.improve B.restore C.exchange D.expand