There is a crowd of people in front of the house over there. What do you suppose _____ there?
We were having a lesson ________ a policeman came in.
We’ll discuss the question that he ________ at the meeting.
________ if you passed the exam you would receive a reward was telling lies.
Success in life doesn’t happen ________. It’s the result of devoting your time and energy to what you’ve set out to do.
When the man was trying to break into the bank, he was caught by the police ________.