Convert into compound sentence

Working hard, he passed the examination.

Transformation of sentences:

Only they can do the work. (Negative)

Write the meaning and make sentence with following Idioms and Phrases:

A vicious circle

Fill in the gaps with appropriate preposition/article

Nobody knows it......... Rahim.

Make Sentence (with meaning) with the following Idioms & Phrases

Lay by

Make sentences with meaning:

Come into force