21. In my hometown there used to be _____ heavy rain now and then, and the river around _____ town rose a lot after the rain.

A. a, a                      B. /, /                       C. a, the                   D. /, a

22. Letterboxes are much more ____ in the UK than in the US, where most people have a mailbox instead.

A. common             B. normal                C. ordinary              D. usual

23. ------ Is your school life _____ of other teens?

------ In many ways, yes.

A. this                      B. the same              C. one                      D. that