me podrian ayudar por favor se ls agradeceria mucho 

complete the sentences with a preposition(in,at,or on)or(-) no preposition

we went to china________2005

i start work__________9:00

i called you _____________five minutes ago

what did you do___________last night?

i relax____the weekend

 i started going out with alice____six months ago

we saw james_______ wednesday

i bougth a car______last year