______you are always optimistic and self-confident, I can’t wait to make friends with you

The other day，my friend John drove his car down the street at _______I thought was a dangerous speed and surprised everyone in the car.

He is such a person who never ________ his health. [ ]

I thought the number of the parents to attend the meeting would be ____. So I need more seat.

Lucy wants an evening job ,so she can _______her son in the day.