用情态动词的适当形式填空。
Can you help me? I _______ never understand this.
_______ you tell me what time it is, please?
Henry _______ walk when he was one year old.
We are going for a walk. _______ you like to join us?
Tom, you _______ leave your clothes on the floor like this.
The road is wet. It _______ have rained last night.
He was waited outside for half an hour. _______ he come in?
These flowers have died. You _______ have watered them.
_______ she be ten years old next month?
I _______ have hurt your feelings but it was not my intention.
You ought to buy some books; prices _______ up these days.
—Must I be home before eight o’clock, Mum?
—Yes, you _______.
My sister _______ wait outside because she left her key in the office.
—What _______ it be?
—It can’t be a desk, for it is moving. It must be a car.
—Is John coming by train?
—He _______, but he may not. He likes driving his car.