Such a custom came into _______ long ago.
| A．being | B．use | C．service | D．existence |
How can you expect him to make any improvement ________you never give him an opportunity to have a try?
| A．unless | B．when | C．until | D．while |
The 2016 Summer Olympic Games will be held in Rio de Janeiro, Brazil, which becomes the first city in South America _________ Olympics.
| A．hosting | B．having hosted |
| C．being hosted | D．to host |
—For the long-term development, we have to attach importance to the quality of our products.
—That’s right. ______.
| A．Great minds think alike |
| B．Two heads are better than one |
| C．In the end things will mend |
| D．Look before you leap |
We students had better ______ some sports because sports can give us a perfect figure and protect us from getting illness easily.
| A．take up | B．make up |
| C．pick up | D．build up |
Finally, the young explorer, through a series of lucky accidents, arrived ______ was so-called the valley of death by the locals.
| A．where | B．what | C． in which | D．in what |