No doubt, the more one is _______ the foreign language environment, the better he or she will learn the language.
| A．referred to | B．caught in |
| C．kept up | D．exposed to |
His name was on the _____ of my tongue, but I just couldn't recall it.
| A．end | B．point | C．edge | D．tip |
Feudal landlords, and imperialists are in no way more _____ than wolves.
| A．reasonable | B．regardless | C．ridiculous | D．rational |
She was putting on her watch when the _____ broke and it fell to the ground.
| A．belt | B．strap | C．tie | D．string |
Psychological studies show that some people are quick-tempered _____.
| A．at heart | B．on purpose | C．in person | D．by nature |
The _____ stuck on the outside of the envelope said "By Air".
| A．label | B．ticket | C．signal | D．sign |