Tom has few problems __________ my words, he is so smart.
— Morning, boys and girls! Please try your best in today’s exam! Good luck to all of you!— ________
—Sir, could you please put out your cigarette? This is a smoke-free (无烟的) school.—______
—How often do you chat with your friends online?— . I'm busy with my study.
the children have fun, parents can take dance lessons on the beach.
The World Health Organization has given some advice on to protect us from being infected(感染) with H7N9.