—Can you do this Maths problem?
—Yes, I _____.

—Who is knocking at the door?
—It ______ be Miss Zhang. Because she has just gone to Japan.

—______ I put the bike here?
—No, you can't.

—______ I finish the work now??
—No, you needn't. You can do it later.?

A teacher ______ also make a mistake if he is not careful enough.

—I like the party so much, but I ______ go home. It's too late.?
—What a pity!?

—I don't mind telling you what I know.?
—You______, I'm not asking you for it.??

用mustn't 或must完成句子。
1.Cars, buses and bikes ______ go when the traffic light is red.?
2. The flowers______be watered every day, or it'll die.?
3. No matter who wants to come in,he ______ knock on the door first.?
4. You must speak to the old politely, ______you??
5. The children ______swim in the lake. It's not safe.?
6. I haven't seen Alice several years. She ______be a big girl.?

—Who is knocking at the door?
—It ______ be Miss Zhang. Because she has just gone to Japan.

—______ I put the bike here?
—No, you can't.