高考英语30分钟专题突破（14）：
介词
1. The teacher is writing ____ a piece of chalk on the blackboard while the students are writing ____ink in exercise books.
A. with, in B. in, with C. in, in D. with, with
2. The worker can make chairs ____ wood, and also can make paper ____ wood.
A. from, of B. of, from C. of. of D. from, from
3. Mary dropped in ____ Mr Smith, but he wasn' t at home, so she went to drop in ____ Mr Smith's office.
A. on, on B. at, at C. on. at D. at. on
4. The teacher is not only strict ____ his pupils but also strict ____ his own work.
A. with, with B.in,in C. in, with D. with, in
