Make sentences with the following Phrases and Idioms:

By and by

Fill in the blanks with preposition:

My younger sister is good .......... Mathematics.

Translate into English:

কয়লা খুলে ময়লা যায় না।

Fill in the blanks with appropriate word or group of word:

The word "disposal" means........

Change the sentences:

Light filled the room.

Change the voice of the following sentences:

Please take the medicine before going to sleep.