_____ their final medical check, the astronauts boarded their spacecraft. [ ]

Do you know when Jim’s coming?—He _____ 9:00 a.m

The old .engineer’s eyes still shone bright in the wrinkled brown face and his step as he came across the room was________，though slow.

________ everybody is here, let’s begin our meeting.

I always tell my students ______ on the road because it’s really dangerous.