Some aspects of a pilot’s job__________ be boring, and pilots often ________ work at inconvenient hours．

—Mr. Wang, must I come again to clean the window on Sunday morning?—No, you _____ . I have asked others to do it.

—Mother, I climbed up to that tall tree and picked this big apple.  —Jesus! You______ down and hurt yourself.

It             be the vocabulary that caused you the problem in the exercise because you know a lot of words.

 Today is Wednesday. He _______be at home. He _______be at school.