She and her family hid away for nearly twenty-five months _____ they were discovered.
| A．After | B．since | C．until | D．before |
Grandpa was shocked by the news. Rarely ______ him so quiet.
| A．do I see | B．had I seen |
| C．I had seen | D．I saw |
It suddenly occurred to him he had left his keys in the office.
| A．whether | B．where | C．which | D．that |
It’s been discovered in the study ______ people are more relieved after forgiving others.
| A．that | B．what | C．which | D．whose |
____ regular exercise is very important, it’s never a good idea to exercise too close to bedtime.
| A．It | B．As | C．Although | D．Unless |
______ Stephon Marbury is an American, he has become a role model among Beijing basketball fans.
| A．As | B．Although | C．When | D．Since |