Choose the correct particle

1. Can you drop
   [by|out]the chemist's on your way home?
2. He's a good spokesperson and gets his views
   [along|across]well.
3. Joan and Mary get
   [ahead|along]very well.
4. Joan worked long hours in order to get
   [along|ahead]in her job.
5. Peter did
   [up|over]the buttons of his shirt.
6. Robert dropped
   [out|by]of university after his first year.
7. The computer crashed and I lost my work. I'll have to do it
   [up|over].