You had better book rooms at the hotel in advance you should find no room on your arrival

The scientist has had a research weather for more than 30 years.

Are these your brothers _________

．—I’ll return the book to Mary，but I can’t find her anywhere．—She ________ the teacher’s office．You can find her there

Do you know where the headmaster is? I have something urgent.　　　　—Oh, he ____ have gone far, for the computer is still on in the office.