In a body (together- একত্রে): We should work in a body. আমাদের সবার একত্রে কাজ করা উচিত।

In a fix (উভয় সংকটে পড়া) He was in a fix and did not know what to do.

In due course (যথাসময়ে) - We will consider the proposal and respond in due course.

In no time = I will go there in no time.

In spite of his working hard, he failed in the examination (Make it interrogative). 

= Though he worked hard, he failed in the examination.

Increase = বৃদ্ধি - Growth

Indigenous = Foreign

synonyms synonyms
indolent- কুড়ে, অলস Lazy- কুড়ে, অলস 

Intelligent = বুদ্ধিমান

Iron is so useful x matter. 

Irony of fate (ভাগ্যের পরিহাস)= He could not succeed by irony of fate.

Isolation = বিচ্ছিন্নকরণ - Separation

It did not rain ......since...... January. (Fill in the blank)

What matters if I fail ?

It is a pen to write with.