-Jenny took the 8:00 bus to Guangzhou this morning.-Really? He__the 9:00 train. It's much more comfortable and safer to travel by train.
It is________ for us to deal with.
There are ________ books in our school library;however,________ of them are old.
Our government are taking firm measures to make pollution________.
________ deep down in the earth,the dead forests rotted away and became coal.
—What happened to the priceless works of art? —________.