21.The moment we heard the news of the earthquake, we began to ________ the work to rescue those who were trapped in the building.
More forests are being destroyed. As a result, a lot of good earth ________ each year.
—Look! Isn’t that Peter’s sister? —No, it ________ be her—I’m sure she doesn’t wear glasses.
________ excited us was that more than 100 miners trapped in the Wangjialin flooded coal mine were saved alive.
Doctors warn people that one may develop skin cancer with his skin ________ to the sun too much.
Fortunately, the bullet narrowly missed the president ________ an inch.