A)
1. He is said to work well.
2. He is said to be a good engineer.
3. He is said to test new devices.
4. He is said to carry out experiments.
5. He is said to study at the University.
B)
1. This device is known to be good.
2. This device is known to operate well.
3. This device is known to be very efficient.
C)
1. He is said to have worked at that Institute.
2. He is said to have invented a new device.
3. He is said to have created a new theory.
4. He is said to have introduced a new method.
5. He is said to have observed this phenomen.