Complete the sentence with in, on, at or no preposition (-).а)

Complete the sentence with in, on, at or no preposition (-).
а) I saw Eloise ___ last night.
б) The project finished ___ the summer.
в) We went to the conference ___ yesterday.
г) Narinder finished the presentation ___ 4:30.
д) Yоu spoke to Pat ___ Wednesday morning.
е) They decided to go to China ___ Мау 14th.
ё) We never work ___ the weekend.
ж) They plan to build the bridge ___ August 2012.