These cars belong to them.These are their cars.然后那么多急可以用十万火急概括了，这个真是还附带个猜成语的环节在。改同义句先看有没有格子，没有格子限制，相对多一点选择。好了，答案就是这样了
They have these cars.
These are their cars.
They are their cars.
