Travelling in a big city isn’t that difficult. Raise your hand, and a taxi will appear_____ .
________matters most in learning English is enough practice.
________you’ve got a chance,you might as well make full use of it.
—Did you return Fred’s call? —I didn’t need to________I’ll see him tomorrow.
Some parts in South China have experienced________this year as they did last year.
Ten years ago the population of our village was________that of theirs.