_____ the fact that his initial(开始的)experiments had failed, Pro. White persisted (坚持) in his research.
John, look at the time. ______ you play the piano at such a late hour ?
It is hard for me to imagine what I would be doing today if I _______ in love at the age of seven, with the Melinda Cox Library in my hometown.
— Are you still going to Shanghai for the Spring Festival?— Yes, but I really _____ because I have a lot of things to deal with.
It is said that there are plenty of hotels in that town. There _____ be any difficulty for you to find somewhere to stay.
When Marx was in London, he _____ read at the library for hours.