— Can we meet at 3 o’clock tomorrow afternoon? — That doesn’t suit me. I’m afraid I _____. [ ]

When something is on fire, people throw sand on it to put out the fire. The main use of the sand is to _________.

What’s the matter ________ you—I’m not feeling ________.

Have you ever seen the film Titanic, ________ leading actor is my favourite

(2013·湖南长沙四校二模)—Is the letter from your mother?—Yes.But she ________the letter herself，because she doesn’t even know one word.