13. ___ had they reached the 30th floor ____ they realized that they had forgotten to take the key.
| A．Hardly; than | B．Hardly; when | C．No sooner; when | D．No sooner; then |
____ has been heated discussion over which country bakes the world’ s best pizza: Italy, where pizza began or the US, where it was globalized.
| A．It | B．There | C．That | D．This |
It was ____ exciting news that more than ten students in a single school were admitted to Tsinghua University in the same year.
| A．one | B．an | C．/ | D．a |
____ the end of the performance did the audience get the chance to take photos with the respectable actor.
| A．At | B．By | C．Up to | D．Not until |
—Don t be so naughty! Be your _____.
—Got it.
| A．manners | B．age | C．behavior | D．politeness |
We should be very ________about giving our personal information to strangers.
| A．happy | B．outgoing | C．ready | D．cautious |