He has promised me that upon my return he for me at the airport.
Upon ______ the office, he saw the message on his desk.
— Where’s Emma? —I can’t say for sure where she is, but she _____ be out shopping.
I always take an umbrella to work with me in spring, _____ it rains.
________ is known to everyone, the moon travels around the earth once every month.
- Have you moved into the new flat? - Not yet, the rooms __________.