A great deal of science and technique has been______since China carried out reform and open policy.
| A．brought down | B．brought in | C．brought out | D．brought up |
The students went into the classroom,________.
| A．talking and laughing | B．talk and laugh |
| C．talked and laughed | D．to talk and laugh |
As Mary ______ a poem, her little sister ______ asleep.
| A．was reading, has fallen | B．was reading, was falling |
| C．was reading, fell | D．read, was falling |
The workers ______ a new restaurant. It is said that the construction work will be finished next month.
| A．have built | B．have been building |
| C．built | D．had built |
When ____ about the possibility that Justin was taken away by aliens, Detective San Peterson, who has taken charge of the case, didn’t say much.
| A．asking | B．asked | C．to ask | D．ask |
There is no hard evidence ____ aliens took Justin that night.
| A．that | B．what | C．which | D．how |