Students are encouraged to _________ the design competition for robots at the university.
Nobody could understand her though she tried to __________ her idea by using the simplest English, because they are foreigners.
We don't know that plan __________ by the teacher is __________ three parts.
Once new difficulties __________ in your work, it's always important to use your brains.
-What is the price of petrol these days? -Oh, it __________ sharply since last month.
Finally the English government tried in the early twentieth century to form the UK by getting Ireland __________ in the same peaceful way.