He pretended ______ the problem, but he ______.
| A．to solve; lay | B．to have solved; lied |
| C．to have solved; laid | D．to solve; lied |
Jack wasn't saying anything, but the teacher smiled at him __________ he had done something very clever.
| A．as if | B．in case |
| C．while | D．though |
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 |