33. We were about to climb up to the top of the mountain ________ it began to rain heavily.
| A．as | B．while | C．when | D．Since |
I won’t see the film tonight. I am busy. ______, it is raining cats and dogs.
| A．Beside | B．However | C．Besides | D．As well as |
Computersin offices and homes since 1970s．
| A．have been used | B．had been used | C．was | D．has been used |
More attention must be paid ____ the endangered animals.
| A．protect | B．to protect | C．to protecting | D．protecting |
She doesn’t like the way _______ you speak to her.
| A．to | B．in that | C．how | D．in which |
The young man helped the company recover, so his boss gave him an apartment
_________.
| A．in return | B．in turn | C．in charge | D．in fact |