Now one of the hottest topics_______ people are talking about is the safety of food.

________its low cost, the appeal of iron asa building material lies in its strength, its resistance to fire, and itspotential to span long distances.

She has many hobbies, ______ drawing, swimming, reading and dancing.[ ]

In a few years, there ________ hundreds of trees on the mountain.

Our city has experienced ___this year as it did last year.