Because of air pollution being greatly reduced, this city is still ______.
____of danger in the street at night, she had to go home, with a friend ___ her.
–How was your interview with the famous basketball player—Yao Ming? --I was quite nervous at first, but his warm smile put me____.
John once worked in a remote mountain village school, which is ____only on foot.
The president was so absorbed in his work that not a sound ______.
–Guess what! Alice has failed in the exam. – ____? She is second to none in English in our class.