.After a fire broke out in the lab, a lot of equipment＿＿.

.Rainforests ＿＿and burned at such a speed that they will disappear from the earth in the future.

.More patients  ＿＿　in hospital this year than last year.

.－－Why did you leave that position?   
－－ I ＿＿a better position at IBM.

.More than a dozen students in that school ＿＿＿ abroad to study medicine last year.

A．sent

B．were sent

C．had sent

D．had been sent

.By the end of last year, another new gymnasium ____ in Beijing.

Every possible means ____, but none ____ successful．

— You may find the key to the maths problem on page 107.
— Ah, it’s so simple. I wonder why I_________of that.   

．Mother ______ us stories when we were young .

. Not one in one hundred children exposed to the disease ______ likely to develop it.