By whom was this bird being killed. 

By whom will you be helped?   = Who will help you?

Can their glory ever fade?   = Their glory can never fade.

Canada is one of the coldest countries in the world. (Comparative) = Canada is colder than most other countries in the world. 

Change the voice. (Passive) = Let the voice be changed.

changed

Changes in the structure and function of your brain from drug abuse make it impossible to safely stop using without professional intervention. If you are abusing any drug, whether prescription or illegal, your brain has adapted to its presence. Your body perceives a normal that is established by the dependence on the drug. Physical effects of drug addiction, as reported by the National Institute on Drug Abuse (NIDA) vary, depending on the drug, but can include heart rhythm irregularities and heart attacks; breathing difficulties and respiratory arrest; nausea, vomiting, and abdominal pain; poor musculoskeletal development, cramping and muscle weakness; kidney and liver damage; seizures and memory loss; and cancer.

Climate change refers to changes beyond the average atmospheric condition that are caused both by
natural factors such as the orbit of earth’s revolution, volcanic activities and crustal movements and
by artificial factors such as the increase in the concentration of greenhouse gases and aerosol. Climate
change by global warming, which refers to the average increase in global temperature, has become a
megatrend that will lead to significant global changes in the future. Concerning its impacts, the UN
Intergovernmental Panel on Climate Change (IPCC) presented considerable scientific evidences in its
fourth report on climate change (2007) and they have become clearly recognized worldwide. In
addition, people have become more aware of the fact that global warming cannot be avoided due to
the continued increase in greenhouse gas emissions and the changes in the climate system. The Club
of Rome Report 1972 officially raised global warming as an international issue and, in 1985, World
Meteorological Organization (WMO) and United Nations Environment Programme (UNEP) officially
declared carbon dioxide as the principal cause of global warming. In order to effectively cope with the
global warming issue, Intergovernmental Panel on Climate Change (IPCC) was organized in 1988 and
has carried out systematic research and in-depth studies on climate change. 

Close to half the world's 6 billions people live on less than Tk 130.00 a day.

Cloth = Cloths/Clothes

Coal dust does not get dirty.

Cold drinks were served to all and sundry.

Columbus invented America. = Columbus discovered America.

Come round (আরোগ্য লাভ করা) - The patient will come round soon.

Come so that you can retain your job.