1) You gained some weight = You put (on, up, in)

1) You gained some weight = You put (on, up, in) a few pounds.
2) Dont tell anyone about it. = Keep it (to, for, in) yourself.
3) Have you been in contact with Sarah? = Have you heard (about, of, from) Sarah?
4) Ive been spending time with her. = Ive been hanging (out, in, on) with her.
5) Please take care of my little sister. = Please look (after, about, at) my little sister.
6) He disappointed me. = He let me (down, back, out).
7) You can trust me. = You can count (at, on, for) me.
8) We often eat in restaurants. = We often eat (around, out, in).
9) I cant understand why you would say that. = I cant figure (in, about, out) why you would
say that.
10) He is planning something. = He is up (to, for, with) something.