Answer:
1)
1. don't run, miss the bus
2. don't have any money, I will lend you some
3. will you do, is
4. will be exhausted, gets home
5. wouldn't do, don't study
2)
1. Sarah would get, if she applied
2. would you choose, if you wanted
3. if you lost your phone, what would you do?
4. would enjoy his job, wasn't on his feet
5. wouldn't be happy, didn't have
3)
1. c
2. a
3. a
4. a
5. a
4)
1. can
2. need to run
3. don't have to finish your hw
4. can't
5. doesn't have to