Cars play an important role in modern life, but they ______ also cause many problems like air pollution.

I wonder such a gentleman as he should ____ an error, though it is a simple and small one.

It was with the help of the local guide_________the mountain climber was rescued.

I recommend the government Real Cine for urban planning since it is cheaper and practical, the way most urban planning is done today.

I ____________ the League for twoyears so far.