When this new kind of virus broke out at first in Mexico, no one had the least idea that it would _______ so rapidly throughout the world.

__ as a volunteer teacher in Tibet for a year, Linda has become more experienced.

The underlined part in the word “welcome” is pronounced as ______.

eeing the film in the theatre, the audience were gasping _____ while falling-on-the-floor laughing.

How about wacthing a football game—__________.