1 . The plan is designed to ________ employees to work more efficiently.

A．motivate

B．cherish

C．clarify

D．occupy

2 . The librarian can't attend the meeting at 4 o'clock this afternoon because he ________ (occupy) himself in checking the new books. (所给词的适当形式填空)

3 . _________ herself preparing dinner, she didn’t hear the phone.(occupy)(所给词的适当形式填空)