In ancient time, textbook was the most (a) — (resource) thing for the students. Teachers were the only guides and source of information. The students had to collect all the (b) — (inform) from the lecture of their (c) — (teach). There was no guidebook or other (d) — (refer) books in the market. During that period a teacher had to deliver a lecture by (e) — (study) the textbook. Because of the (f) — (situate) the students used to depend on the teachers (g) — (complete). As a result, there was a great (h) — (relate) between a (i) — (teach) and a student. Their (j) — (popular) existed among the students in the society.