【題目】The companies are working together to create _________ they hope will be the best means of transport in the 21st century.
【題目】With a lot of questions _________, the official is having a hard time.
A.answeredB.to answerC.answeringD.being answered
【題目】The Dragon Boat Festival is _______ a Chinese poet, Qu Yuan.
A.in memory ofB.in favour ofC.in charge ofD.in case of
【題目】I found it no use _______ to persuade him to give up smoking.
A.TryB.to tryC.tryingD.having tried