_____ we were singing, the teacher came in.
| A．Before | B．after | C．As | D．Until |
It was along the Mississippi River _________ Mark Twain spent much of his childhood.
| A．how |
| B．which |
| C．that |
| D．where |
If you have a job, ______ yourself to it and finally you will succeed.
| A．do devote |
| B．don’t devote |
| C．be devoting |
| D．to devote |
It is not how much we do but how much love we put into what we do ________ benefits our work most.
| A．who |
| B．which |
| C．that |
| D．what |
Was it on a lonely islandhe was saved one month after the boat went down.
| A．where |
| B．that |
| C．which |
| D．what |
John's success has nothing to do with good luck. It is years of hard work _______has made him a great scientist today.
| A．that |
| B．when |
| C．which |
| D．why |