There is ________"m" and ________"u" in the word "mouth".
It’s careless _____ him to make the same mistake again. I think it important ______ everyone to be careful in everything.
In order to enter the PE exam, now we spend at _____ least half _____hour a day at school.
—Hi, Mary. __________? —Not so well. I can’t keep up with the other students.
—What did your son say in the letter? —He told me that he __________ the Great Wall the next day.
—Would you please tell me __________? —OK, her name is Cici.