1．(2019·天津卷改编)The professor warned the students that on no account should they (they, should) use mobile phones in his class.
2．(2018·全国卷Ⅱ)China's approach to protecting its environment while feeding (feed) its citizens “offers useful lessons for agriculture and food policymakers worldwide，” says the bank's Juergen Voegele.
3．(天津卷)It was when I got back to my apartment that I first came across my new neighbors.
4．What is the chance of there being (be) some good dictionaries in that bookstore?
5．What an interesting role she played in the film！No wonder she has won an Oscar!
6．If you have a job, do devote yourself to it and finally you'll succeed.
7．He must be helping the old man to water the flowers, isn't he？
