very easy
piece of cake
be pregnant
(have a) bun in the oven
something you don't enjoy
(not my) cup of tea
a person who is often in trouble
a bad egg
very relaxed
cool as a cucumber
to make troubles
be a pain in the neck
to make the first step
break the ice
reveal the truth
spill the beans
get upset over something that has happened and cannot be changed
cry over spilled milk