Help yourself to __________.

Could you please tell me _______—- Yes. They are playing in the park.

The meeting ________ over, all of them left the room, ________ to lock the door.[ ]

id not see him at the lectureyesterday．— You _______ him, since I went to aninternational conference with him．

The success of a government should be measured ________ the health and happiness of the people as well as the development of economy.[ ]