1.The river is about 10 meters deep.（对划线部分提问） —————————— ___ ___ is the river?
1.The river is about 10 meters deep.（对划线部分提问）
——————————
___ ___ is the river?
2.This is a tree. He planted the tree 3 years ago.（合并为一个含有特定语从句的复合句）
This is the tree ___ he planted 3 yeats ago.