Mr. Smith insisted that his book _______within three days.

---Do you know where David is? I couldn’t find him anywhere. ---Well. He ______ have gone far----his coat’s still here.

It is usually warm in my hometown in March, but it _____ be rather cold sometimes.

All the students suggested that they __________ two weeks to prepare for the exam.

He ___ be in the garden.He must be in the room.‘