Answer:
1. "thanks. i'll give you a call if i need some help tomorrow."
2. were i you, I'd think twice about that decision. it could be a bad move.
3. Students working for their 1st degree at a university are called undergraduates.
4. Whoever wants to take the GCE 'A' Level has to achieve high grades at the GCSE examination.
5. Hurry up! We've got to leave the house immediately. Otherwise, we're going to miss the opening ceremony
6. If you had listened to my advice in the first place, you wouldn't be in this mess right now.
7. A huge tree crashed through the bedroom roof and broke my bed and most of the other furniture had I been in the room, I would have been killed.
8. Unless you answer all of my questions, I can't do anything to help you.
I hope this helps