Question

4. Don't leave the room
........... I'm back

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Answer 1

Don't leave the room until I'm back.

A quick FYI :

A lot of words can be filled up in here. For Ex: You can fill up the word 'unless' and by doing so the sentence would be "Don't leave the room unless I'm back"

Moreover, you may also use the word 'till' and again the sentence would be "Don't leave the room till I'm back". As a matter of fact, the words 'until' and 'till' can be used simultaneously in a sentence but using 'until' is more preferable 'cause it just sounds more formal. Or you may say that 'until' is just a more formal version of the word 'till'.

Answer 2

Answer:

till

Explanation:

it is till because someone one is good out and saying you to stay,so it is an present continuous tense