For forty years Jane has been ___________ about making the rest of the world understand and respect the life of these animals.
At first the experiment went on well, but ______ problems we hadn’t expected turned up later and it failed.
The old house is regarded as a part of local history, so it should be ______.
______ has finished the work ahead of time will be rewarded with a one-month holiday.
Zhao Benshan is famous ______ his humour and Liu Qian is famous ______ a magician.
-John is said to have learned Italian in Italy for five years. -______ he speaks it like a native speaker.