________volcanoes now for many years, I am still as enthusiastic about my job as the first day I first______.
| A．Studied, started | B．Have studied, started |
| C．Having studied, started | D．Having studied, starting |
I feel proud to be born into a family education is highly valued.
| A．where | B．that | C．which | D．who |
Some of the government officials are not doing their jobs well since some of the questions from the ordinary people never get .
| A．to answer | B．answering | C．answered | D．to be answered |
It never occurred to humans until the mid-1990s some animals can be cloned.
| A．where | B．that | C．when | D．what |
After the company from his father, he got into a big trouble for the lack of money.
| A．giving away | B．taking over | C．selling out | D．setting up |
The kid was making noise just to attract attention. Let him be!
| A．in addition | B．in vain | C．on average | D．on purpose |