The athletes competed ________ each other for gold medals in the Olympic Games.

Is Jack on duty today? —It ______be him. It is his turn tomorrow.

Put yourself in situations _____ you will be forced to communicate in English, and you will see more progress over time .

Why don’t you bring ______ to his attention that you’re too ill to go on working?[ ]

er busy he is, he willsome time for exercise every day—No wonder he is always so energetic