—Where is our English teacher?
—She is in the classroom, _____ the exercises _________ the students have done at home.
| A．explaining; / | B．explaining; for |
| C．explained; to | D．explained; from[ |
________ was most important to her，she told me，was her family.
| A．It | B．This | C．What | D．As |
It suddenly occurred to him ________ he had left his keys in the office.(2012·江西)
| A．whether | B．where | C．which | D．that |
Have you noticed the problem ________ he is now in low spirits？________ come?
| A．where；What | B．that；How |
| C．in which；For | D．what；As |
When the news came ________ the war broke out，he decided，to serve in the army.
| A．since | B．which | C．that | D．because |
________ was known to us all that Johnson had broken his promise ________ he would give each of us a small gift.
| A．As；which | B．What；that |
| C．It；that | D．It；which |