When last ________valuable，those books enjoyed great success.
| A．finding |
| B．found |
| C．being found |
| D．to be found |
________ you have a large vocabulary, you will find it easy to read.
| A．Once | B．Before | C．Unless | D．Even though |
________ you met the foreigner from Canada?
A. Where it was thatB Who it was that
C. Where was it thatD. Where was that
___ staying at hotels in Red River Village, tourists can help the villagers make money so that they can take _____the river and the birds.
| A．By; care for | B．By; care of |
| C．Through; care about | D．With; care of |
Paul started hiking in 2010 and he has hiked across 11 countries __________.
| A．ever since | B．from then on | C．right away | D．at once |
Saving money is ________ we must do.
| A．what that | B．anything that | C．something that | D．something which |