列出算式,把相應(yīng)的英語數(shù)字寫在橫線上。
There are two horses on the farm.
Two more horses come.
How many horses are there in all?
_______________________ horses
There are ten fish in the river.
Three fish swim away.
How many fish are left?
_______________________ fish
There are seven hens.
Eight more hens come.
How many hens are there in all?
_______________________ hens
There are eight dogs.
Four dogs go away.
How many dogs are left?
_______________________ dogs