（2017江苏南京）—When did the classroom have a power cut?
—This morning, while we ________ a physics lesson.
A.have had B.were having C.are having D.will have
— Would you like to see the hit film called "The Wandering Earth" or go shopping this weekend?
— ________ I prefer to surf the Internet at home.
A.Either. B.Both. C.None. D.Neither.
The volunteer spoke as ________ as he could to make the visitors understand him.
A.clearly B.more clearly C.the most clearly D.most clearly
The old couple felt very ________ after their children went abroad a few months ago.
A.angry B.happily C.luckily D.lonely
— ________ do you go to the city's public library, Susie?
— Once every two or three weeks.
A.How often B.How long C.How far D.How soon
Ben didn't give up ________ the job was hard and tiring for him in the beginning.
A.before B.although C.unless D.if
