— When will the bike-sharing schemes be introduced to the public?
— Not until _______ a better understanding of them.
A. we have had B. will we have had
C. have we had D. we will have had
Bob was trying to ______ that he knew the famous singer who would perform in our city.
A. lay out B. let out C. figure out D. make out
When entering the office, _____.
A. Winifred was found sitting at a desk B. Winifred was found sat at a desk
C. we found Winifred seated at a desk D. we found Winifred seating at a desk
_____ the opening ceremony of the Hong Kong-Zhuhai-Macao Bridge was President Xi Jinping accompanied by leading officials of Hong Kong, Macao and Guangdong province.
A. Attending B. Having attended
C. Attended D. To attend
Life is a tough journey, to some extent, _______ you still smile and love even though you are occasionally hurt and betrayed.
A. where B. what C. when D. which
We need a comprehensive _____ of the genetically modified food, under the leadership of the central government.
A. accumulation B. assessment
C. assistance D. accountant
