Keep in 

(no allow someone out)

1.- Policemen suggested keeping ourselves in until they find the thieves 

2.- It has been snowing since yesterday. That is why we will keep ourselves in today.

Keep from 

(to not do)

1.-He has been very clumsy She found it hard to keep from laughing.

2.- It's difficult to keep from worrying about this situation.

Keep  Down

( no vomit)

1.-After the party  I could not keep myself down.

2.-I could not keep it down after getting off the roller coaster.

Keep Away from

(avoid someone or something)

1.-He keeps away from the garden. He has a lot of allergies.

2.-The next-door Neighbor does not like Dogs. You must keep your dog away from his house.

Keep around 

( something/one near )

1.-I Keep a dictionary around when reading Spanish books.

2.- Susan keeps her asma pills around when she travels abroad.

Keep on

(to continue)

1.- She kept on talking after I told her to be quiet.

2.- The rain kept on throughout the day.