The book was written careful observations and detailed studies.
| A．on the ground of | B．on behalf of |
| C．on average | D．on the basis of |
The experts were doing their experiment in the lab, __________ what happened outside.
| A．didn't know | B．not knew |
| C．not knowing | D．having not known |
The old man stood by the window, __________ his eyes on the people playing in the park.
| A．fix | B．fixing |
| C．fixed | D．to fix |
If you are a man who always __________ to do everything, you are unlikely to achieve your goal.
| A．pretends | B．offers |
| C．manages | D．hesitates |
Many people are against the new policy while some lawyers are __________ it.
| A．in favour of | B．in memory of |
| C．in honor of | D．in search of |
__________ an hour in the morning and you will be looking for it during the rest of the day.
| A．Losing | B．To lose |
| C．Lose | D．Lost |