问题补充：
A lot of stone tables and chairs are of the river and the number of them is growing .
A. on both side ; greater
B. on each side ; more
C. on both sides ; larger
D. on each side ; more
答案：
A. on both side ; greater
B. on each side ; more
(答案→)C. on both sides ; larger
D. on each side ; more
解析：the number的增长表示larger，用比较级，on both sides，both后接名词复数形式，故选C
