Complete the sentences using the prepositions against, at, by, for, in, on, of, to where necessary. 1) All together

1) now my close friend lives in moscow . 2) as a rule he spends his holidays at the seaside . 3) i’m very busy on sunday .4)  when i need help he often helps me .5)  she is always glad to see me .6) there is nothing to think about .