21. If you have ________ learning English, you could ask the teacher for help.
A. trouble B. solution C. decision
22. She is very shy and she is terrified ________ speaking in front of other people.
A. to B. of C. with
23. Please concentrate on your study, ________ you’ll fail the exam.
A. or B. and C. but
24. Don’t talk ________ in the library, they are reading.
A. loudly B. quickly C. slowly
