The mentioned expressions are significant to acquire 7 or higher band score in IELTS Speaking

Useful IELTS expressions for Band 7

To begin with ( To start with , in the beginning, an introduction remark)
首先

Well, to begin with, I would like to say that I am a big of sports.

At the end of the day ( In the last, In conclusion) 
综上所述, 最后我想说

At the end of the day, the important thing is to be patient.

Run out of ( something finishes soon, be used up) 
用光
We have run out of milk.

Be up to one's neck ( To be really busy)
很忙

I will be up to my neck tonight.