_____ not to miss the flight at 15:20. the manager set out for the airport in a hurry.
As the final examination is coming , the students are busy ____ it.
He likes the birthday presents ______ his friends gave him.
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.