12. Complete the following sentences with phases or expressions from the passage. Change the form where necessary.
1. Let's stop arguing arguing; we have to find a solution to the problem. 2. It's too late today. Let's call it a day and the discussion again tomorrow. 3. The thesis is no easy work; you have to over it for months. 4. College students are expected to equip themselves with necessary knowledge and skills before they society. 5. Please turn to page 46; that's where we last time.
Anwser: 1. for the sake of 2. pick up 3. break your back 4. get at 5. left off