In the time of social reform, people’s state of mind tends to keep _____ with the rapid change of society.
I think you should end it _______ it’s too late, or you may be sorry about it later.
The doctor could ______ by the symptom that the patient caught flu.
I can’t stand ________ with Jane in the same office. She just refuses _______ talking while she works.
I’m considering _______ a washing machine, which is considered ________ a great help to my wife.
By the time he was twelve, Edison ________ to make a living by himself .