what is needed is acts 中的is needed是主语补足语吗

what is needed is acts 中的is needed是主语补足语吗 Water is needed e____ Change is Needed "Advice when is most needed is least needed. Take whatever action is needed. 英语翻译 more than is needed 为什么不用that is needed? what is needed in oeder to study abroad? _________with children, I know what is needed most. What is the most needed English knowledge in China that is what i call music这句话中的what是做宾语补足语吗? 主语是什么成分?All ___ is needed is a continuous supply of fuel oil