Which of the underlined words or phrases is INCORRECT? Last week, Marks writes three emails about his new business plan …

Lisa read five books before she .................. her essay.

Geography 101 ...................... at our university last year.

Mark came to Ben’s office… ............ the evening.

I do not understand this sentence. What ............................ ?

If you wait 20 minutes, I can take you to the clinic ……………….