Choose the correct preposition to complete the senteces:
1.His life depends___________(in,on,out,over)a heart transplant.
2.The police ran_______(into,after,for,around) the thieves but didn't catch them.
3. I am sorry but John is __________ (in, on,at,for) holiday at the moment.
4. We must pass this test ____________ (at,in,up,with) all costs.
5. The students couldn't get _____(into,off,over, towards) the steel barricades.