1.i was ______ out to visit my aunt in the nearby town _____

1.i was ______ out to visit my aunt in the nearby town ______it began to rain heavily.
A.about to go,when
B.about to go,while
c.to go ,as
D.to go,until
2.i know how to _____the boy work if you ___me take care of him.
A.let,make
B.let ,let
C.make,let
D.make,want
3.i have written a letter to Smith and suggested _____it to the manager.
A.he send
b.for him to send
C.he sends
D.he will send
都是分别选哪个,请详细说明理由,