44. In order to enjoy a different educational experience , a lot of students choose studying in a foreign country 

45. This is the most challenging task for me to deal with in my mathematics class 

- Lý thuyết : 

* In order / So as to + V-inf  : để mà 

* Công thức thì hiện tại hoàn thành : S + have / has + Ved /V3  

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`44.` In  order to enjoy a different educational experience, a lot of students choose studying in a foreign country.

`-`  clause + so that + clause:.. để..

* clause: mệnh đề _ gồm S+V

`=` in order to +V, + clause: để..,..

`45.` This is the most challenging task for me to deal with in my mathematics class .

`-` so sánh nhất:

S+ V/be ( chia theo S) + the most+ adv/adj+..

`-` HTHT:

 S + have / has + V-ed /V3+...

`-` deal with sth: đối phó với c gì