It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.
Every boy and every girl ________ pleased when they saw Shenzhou VI was sent up to space.
—How long have you been in this office? —Just a few minutes. My cousins__________here together with me.
In America, _____ car is _____ popular means of transportation.
—I would like to buy an expensive camera. —Well, we have several models________.
I remember _____the factory owed a small workshop and two machines.