We watched the plane _________ behind the clouds. A: is disappearing B: disappeared C: being disappeared D: disappearing

Many kinds of wild animals ______ from the earth. A: being disappearing B: being disappeared C: are disappearing D: are disappeared

The<br/>biological species on Earth is disappearing at an ______ rate.

The little girl from the farm was disappearing and being ____ (replace) by a woman in the big city.

They have been living under the most ______________ conditions. A: appalling B: appealing C: appearing D: disappearing

—What's wrong with the book —One page is ______. A: disappeared B: losing C: missing D: disappearing

The forest is disappearing because_______. A: the Penan are burning it B: the government is building villages C: the logging companies are cutting it down

Some Chinese traditions are gradually disappearing （） some other traditions are coming back. A: while B: what C: whatever D: where

A _____ thought crossed my mind but I managed to calm myself down quickly.( ) A: discussing B: disappearing C: disturbing D: discovering

The washing machine factory guaranteed that all parts would be replaced without charge. A: disappearing B: unused C: defective D: miss