1____you go toschool by bus

Children under 12 years of age in that country _____ be under adult supervision when in a public library. [ ]

It is the fourth time that Tom ______ in the maths exams.

Who’s the greatest man — Stephen Hawking, I think.

Even though Jack has failed many times in his experiment, he holds a belief________he will succeed one day if he carries on with it. [ ]