Помогите с временами
Mr. Brown ... for the first time two years ago.

a) registers. b) has registered. c) registered. d) would register.

So last year he ... .
a) registering. b) didn't register. c) didn't registered. d) was register.

His colleages also ask Mr. Brown why he has avoided ... for classes.
a) register. b) to register. c) registering. d) registered.