—It's difficult to get to the other side of the river.—I think a bridge ________ over the river.
The number of the tigers is getting ________. If we don’t help them, they will disappear ______a few years
_____ good time we are having!
At first, we didn’t know _______to do.
Shanghai is larger than ___________in Jiangsu.
The ______ of living areas makes wild animals become fewer than before