.Shortly after we .the chairman took his place and declared the meeting open . 
| A．sat ourselves | B．seated down | C．were seated | D．seated |
I’m protecting myself mosquitoes.
| A．from | B．in | C．on | D．at |
What must be done if wildlife protection is?
| A．success | B．succeed | C．successful | D．to succeed |
----____ I take the book out?
---- I’m afraid not.
| A．Will | B．Must | C．May | D．Need |
Food, ______ and shelter are the three most necessary things for people to depend on.
A. clothes B. clothing C, cloth D. dress
I into robots and used to make mobile phones as well as help with medical operations.
| A．have put | B．have been put | C．had put | D．had been put |