21. What do you advise for _____ ink from my clothes?
A. removing B. moving C. getting D. bringing
22. The student pretended _____ when the teacher came in the classroom.
A. to be studied B. studying C. to be studying D. to study
23. Language is a city, to the building of _____ every human being brought a stone.
A. which B. that C. it D. this
24. The clever boy made a hole in the wall,______ he could see what was happening inside the house.
A. at which B. in which C. through which D. by which
25. I was surprised to find out that we _____ the same school.
A. join B. take part in C. attend D. go in for
