You _____ throw litter on the streets.
Chọn đáp án A
I put my keys on the table, but now it's gone. Someone_____ have taken it.
When my father was young, he _____ work in the garden for long hours.
Daisy is reading her English test because she has a test tomorrow. She_____ be studying.
My mother permitted me to go out at night. She said, "You_____ go out tonight".