用所给词的适当形式填空.There are several _______ (magazine) for you to choose from

前面是复数的be动词are,所以证明后边的名词要用复数，杂志是可数名词所以，填magazines。
这就是所谓的主谓一致

There are several magazines (magazine) for you to choose from.

magazines 就用复数吧