10. Heart trouble is one of the most serious _____ of death among old people.
| A．reasons | B．troubles | C．illnesses | D．Causes |
_____ to read the lat1est novel. Which is not right?
| A．don't wait |
| B．am impatient |
| C．can't wait |
| D．can hardly wait |
Finding in-formation in today's world is easy. The _____ is how you can tell if the in-formation you get is useful or not.
| A．ability |
| B．competition |
| C．challenge |
| D．knowledge |
When the news came _____ the war broke out, he decided to serve in the army.
| A．since | B．which | C．that | D．because |
He had a wonderful childhood，_____ with his mother to all corners of the world.
| A．travel | B．to travel | C．traveled | D．traveling |
_____ around the fire, the tourists danced with the local people.
| A．Gather |
| B．To gather |
| C．Gathering |
| D．To be gathering |