Preparing for the 'oposiciones': grammar transformation exercise

The 'opos' are around the corner, so I have devised an 'intensive training' plan (a post a day) to keep you fit for the 'grand final'.
Here's the first one: a transformation exercise, very useful for reviewing grammar. If you manage to get 100% correct answers in this type of test most of the times, you can be reasonably sure that grammar has no secrets for you.

Re-write the sentences using the word given in brackets, so that the second sentence has the same meaning as the first:

1.- Please don't smoke in this room. (rather)
1.- ............................ in this room.

2.- What a shame. There's no beer left. (wish)
2.- .....................beer left.

3.- What a shame. They ate all the food. (wish)
3.- .................................. all the food.

4.- Leave the shop or I'll the police. (unless)
4.- I'll call the police ....................

5.- Helen suddenly realized that the neighbour was watching her.(watched)
5.- Helen realized .............................................. the neighbour.

KEY

1.- I'd rather you didn't smoke
2.- I wish there was/were some
3.- I wish they hadn't eaten
4.- unless you leave the shop
5.- that she was being watched by