The English play ______ many students acted at the New year’s party was a great success.
| A．for which | B．at which | C．on which | D．in which |
It is clear that no use can be made ______radium _____we don’t know clearly the characteristics of it.
| A．from; if | B．of; unless | C．from; unless | D．of; if |
From my point of view, the theory that ______ by the scientist is not quite scientific.
| A．was risen | B．brought up | C．had been raised | D．was put forward |
The invention of steam engine greatly sped up the industrial revolution, which _____ a lot to the take-off of the world.
| A．led | B．contributed | C．constructed | D．exposed |
I came here with your mother ________ to see you.
| A．specially | B．special | C．especially | D．especial |
How did all these _________?
| A．came out | B．come up | C．come across | D．come about |