If you are traveling___ the customs are really foreign to your own, please do as the Romans do.
| A．to which | B．in which | C．that | D．where |
Edward, you play so well. But I_____________you played the piano.
| A．didn’t know | B．hadn’t known | C．don’t know | D．haven’t known |
— Kingston was late for class this morning again.
— You know, _________.
| A．all good things come to an end |
| B．a leopard(豹)cannot change its spots |
| C．never judge a person by the clothes he wears |
| D．a work ill done must be twice done |
You didn’t take his advice. ________ his advice, you ________such a stupid mistake.
| A．Had you taken; wouldn’t have made |
| B．If you had taken; would make |
| C．Were you to take; shouldn’t have made |
| D．Have you taken; won’t have made |
The radiation amount of a mobile phone for two half-hour periods per day is equal to ________ to an X-ray for ten seconds.
| A．expose | B．exposing | C．exposed | D．being exposed |
. ________ he realized it was too late to return home.
| A．Not until dark | B．It was until dark |
| C．It was not until dark that | D．It was dark that |