All approaches you thought the problem are very reasonable.
A.of solving B.to solve C.of to solving D.to solving
The book has helped me greatly in my daily communication, especially at work ________ a good impression is a must.
A.which B.when C.as D.where
— What do you think made Mary so excited?
— the annular solar eclipse(日环食).
A.As she watched B.Watched
C.Watching D.Because of watching
It was only when Tom ate Zongzi for a second time to appreciate its deliciousness.
A.did he begin B.that he began C.then he began D.had he begun
Mark Twain’s The Adventures of Huckleberry Finn, one of the great American novels, ________ first published in the United States in 1885.
A.was B.were C.has been D.had been
Waves of red light are about twice as long as of blue light.
A.that B.these C.those D.it
