Differencee between on holiday and on leave

Test No. [color=blue]incompl/inter-1 “Applying for that Job”, question 4

The reason there are no buses is because the drivers are on .

(a) hit
(b) stop
© strike :smiley:
(d) leave

Test No. [color=blue]incompl/inter-1 “Applying for that Job”, answer 4

The reason there are no buses is because the drivers are on strike.

Correct answer: © strike
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As you explained that on leave means on vacation. So can i say " I want to spend my summer to be on leave" Or I’m not stay at home, i 'm on leave?

You could say spend the summer on leave. Your second sentence: I’m not staying at home, I’m on leave doesn’t really make sense because the two states are not really related. You could say: I’m not staying at home because I’m going on holiday.