The passage of HL2 Episode One (Half-Life 2)

Can't go Strider, all missiles spent on it, kills 5 seconds after revival. How to cope? At least that, if cheat tell me!

Help!
after a train accident, when in the car Alex was trapped by a Stalker, I put it aside, she jumped down-I followed, and it is not there.
without it there can not go the force field. what to do then?

What to do if the head of the secret halve the first 2 episode Alyx is stuck in the Elevator and utopias in the wall?

At the beginning of the Chapter