Jonh want to try _______riding because it looks fun and he love horses.(without)

Question 1:
1,Jonh want to try _______riding because it looks fun and he love horses.(without)
2,The sky look cloudy.It's ___________to rain.
question 2:choose the INCBRRECT word or phrase in the following sentence:
his father goes swim once a week.
a.goes   b.swim   c.once  d.week.