When you’re learning to drive, _____ a good teacher makes a big difference.

Over the years the European Union has made great efforts to _______ the safety of food and protect the health of its people.

You must ______ a wide vocabulary if you want to learn a language well. 

He was asked to _______ his class making a speech at the school opening ceremony.

So far this year we __________ a rapid rise in food prices by between 10 and 20 percent．