Hurry up! The bus is coming.—Wait a minute. Don’t cross the street ____________the traffic lights are green.

Although human evolution has _______ in the past 10,000 years, we are changing our environment faster still

I often see him working hard in his spare time —________he has won the scholarship from time to time

Sam runs much than his brother.

It was in the park __________ the two old friends ran into each other. [ ]