hmm, catch a cold or catch cold?

my summer vacation It's the first summer vacation after i entered the unversity.Yes,I have less homework to do ,but it's still busy...I failed to pass my maths exam:( so i have to take a make up test.it sucks... i did some volunteer jobs(not for the EXPO). now..its coming to the end...many things happened ...i gained and lost...

it is "be caught in the rain "or" by the rain".i knew it but i forget it ...

First notebook entry: Introducing myself hey,im zhu jiajun.im learning english.i speak good mandarin.i like movies ,though i dont have much time for it...why do i learn english???i dont know!the day i found i was learning it,it has been a long time since i learnt it.