If you are caught driving after drinking, the fine be paid in cash according to the traffic rules.
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.