The sign means “ _____”.

TheideapuzzledmesomuchthatIstoppedforafewsecondstotryto________.

、To our great surprise, the disabled person made a requirement that heas a volunteer

You needn’t have ________ the speaker when he wasspeaking; there was enough time afterwards for you to ask questions.

The number of people in the world ________ about 6 billion and large quantities of waste ________ each year.[ ]