The real English songs are hard to understand.=It's_____hard______understand the real English

The real English songs are hard to understand.=It's_____hard______understand the real English
1：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~~~~~~