Paper money was in＿＿＿use in China when Marco Polo visited the country in＿＿＿thirteenth century．
| A．the；／ | B．the； the | C．／； the | D．／；／ |
.When he was a boy, he used to go there and watch _____.
| A．to repair bicycles | B．bicycles to be repaired |
| C．bicycles being repaired | D．repairing bicycles |
Meeting my uncle after all these years was an unforgettable moment, _____ I will always treasure.
| A．that | B．one | C．it | D．what |
.Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.
| A．it, it | B．what, what | C．it, what | D．what, it |
. --- What’s the matter with Jason? He looks a bit upset.
--- Didn’t you know? When returning from his holiday last night, he found his house _____.
| A．broken in | B．broken into |
| C．broken out | D．broken down |
. To learn more about the book, Saving Ourselves, ________ to www.saving ourselves.com.
| A．going | B．to go | C．gone | D．go |