21.Our ______ problem was lack of time to review the details of our plan.
A. principal B. bare C. hardly D. identical
22.He carefully _________ the key in the lock and opened the door.
A. proceeded B. endured C. provoked D. inserted
23. My father’s words will always strongly____ my mind.
A. be impressed upon B. impress upon C. impress D. be impressed in
24. Hi, don’t snap ____ me, I have done nothing wrong.
A. x B. at C. to D. on
25. Right now, some students do part-time jobs, like____ flyers on the street for some companies.
A. passing on B. passing out C. passing by D. passing away