It was the quality of life in the future I took this training course，not just to make more money.
| A．to improve; that | B．improving; when | C．to improve; when | D．improving; that |
. Don't bother Tom, he is with the experiment on water molecules in the lab.
| A．focused | B．fixed | C．occupied | D．concentrated |
It’s____ comfort to know that so many people are donating money and food to the people in need.
| A．/, the | B．a, the | C．a, / | D．/, a |
_________ the project in time, the workers were working at weekends.
| A．Completing | B．Having completed | C．To have completed | D．To complete |
. _________ many times, he finally understood it.
| A．Told | B．Telling | C．Having told | D．Having been told |
The chairman thought _________ necessary to invite Professor Smith to speak at the meeting.
| A．that | B．it | C．this | D．him |