．_________the fact that doctors have warned that smoking causes cancer, people still keep on smoking

In fact fuels we burn and plant food we eat ________ their chemical energy in the form of heat.

’t think he is fit for the job, ______——Why do you think so

____ a pen, two pencils and threebooks on the desk.

Where ＿＿＿＿＿? —— I got stuck in the heavy traffic.I ＿＿＿＿＿ here earlier