It is reported that the water in the river is becoming worse and worse, the river around the city ____ with waste from factories．
| A．polluting | B．polluted |
| C．having polluted | D．to pollute |
_____that the girl with an incurable disease would die soon, the boy decided to help her make her last days beautiful and meaningful.
| A．Being found out | B．Found out | C．To find out | D．Having found out |
Exploring _____space is exciting, yet dangerous.
There is _____need for both robots and humans for space exploration.
| A．the; a | B．a; a | C．/; a | D．/; the |
Life is like time. Once _____, it never returns.
| A．to lose | B．loving | C．lost | D．being lost |
The company gave away 300 dictionaries to the students at the beginning of the term, and _____500 the next term.
| A．more | B．another | C．other | D．further |
While many believe Benjamin Franklin to have discovered electricity, recent findings seem to show _____.
| A．anyway | B．otherwise | C．somehow | D．so |