vicious circle
.
as cool as a cucumber
.
beauty is only skin deep
.
follow the crowd
.
tackle an issue/problem
.
to tempt fate
.
I don´t buy it
.
the sky is the limit
.
keep a straight face
.
in a nutshell
.
two thumbs up
.
my cup of tee
.
to be on smb`s mind
.
keep an eye on
.
under the weather
.
a piece of cake
.
