it is really hard to say which one is the best.i____(choose)one later.请说明句子的意思和为什么这么做

It is hard to it is really hard to find a girl who can speack english ____ is really hard ___ them to clirnb mount qomolangmathis ,to it ,for this ,for it ,to This book is 100 percent in English.It is really hard for me to read it.是什么意思? It is hard to wait It is hard to please It is hard to select! It is still sick!Really hard for me ah! It’s really hard to tell you I’m It’s really hard to tell you I’m It’s really hard to tell you I’m it is really hard to find a nice place in this city()we can have a pinic AwhereBhatCwhichDwhen I really （ ）help NO,it is （t ）hard to understand the English novels 添单词 -----is really hard-------them to workout the problem填什么 is that really that hard to meet Mr. it was raining really hard It is hard to study English g______well. it is time to study hard!