Although medical science ______ control over several dangerous diseases, what worries us is that some of them are returning.
| A．achieved | B．has achieved | C．will achieve | D．had achieved |
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 |
It was 80 years before Christopher Columbus crossed the Atlantic______ Zheng sailed to East Africa
| A．when |
| B．that |
| C．after |
| D．since |