The real English songs are hard to understand.=It's-----hard

The real English songs are hard to understand.=It's_____hard______understand the real English1：The real English songs are hard to understand.=It's_____hard______understand the real English songs. 2：关于学习英语,你有更具体的建议吗?Do you have ang more_____ _____ about learning English. 3：这类书对我们一点儿用处也没有.This kind of book is _____ helpful _____ ______ to us. 谢谢啊~~~~~~