Well off=someone who is well-off is rich enough to be able to do and buy most of the things that they want.
Her family was very well off.

I said to my teacher, 'Good morning, sir'. (indirect) 

= I respectfully wished my teacher good morning.

The chair is made from wood. 

= The chair is made of wood.

The author name of "The Secret Garden" is Frances Eliza Hodgson Burnett.

The Global warming

Global Warming is a dangerous effect on our environment that we are facing these days. Rapid industrialization, increase in the population growth and pollution are causing a rise in Global Warming. Global Warming refers to the increase in the average temperature of the earth's surface during the last century. Global warming is having a number of effects on the Earth. The most significant effect is the rise in sea level. The Earth’s average sea level has risen about 8 inches since 1880. Scientists believe that the sea level will rise another 1 to 4 feet by the end of the 21st century. The rise in sea level is caused by the melting of glaciers and the expansion of seawater as it warms. The rise in sea level will cause flooding and will damage coastal areas.Global warming is a gradual increase in the temperature of the earth surface and atmosphere all around the world. It is caused due to the greenhouse effect of increased level of green house gases such as carbon dioxide, CFCs, etc. There are various types of pollutants also which involved in increasing the atmospheric temperature of the earth. Increasing use of fossil fuels by the people and deforestation is increasing carbon dioxide emissions which trap heat and cause greenhouse effect.

Do you know he lives where? 

= Do you know where he lives?

Ever you been to Dhaka? 

= Have you ever been to Dhaka?

The army is a collection of soldier. 

= The army is a collection of soldiers.

I returned back form Dhaka. 

= I returned from Dhaka.

Increase = বৃদ্ধি - Growth

Isolation = বিচ্ছিন্নকরণ - Separation

Keen = ধারালো - Sharp

Beautiful = চমৎকার - Gorgeous

Morbidity = বিষণ্ণতা - Sadness

2x+y = 8 ............(1)

বা, y = 8 - 2x

আবার, 3x-2y = 5

বা, 3x-2(8-2x) = 5

বা, 3x-16+4x = 5

বা, 7x-16=5

বা, 7x = 21

∴ x = 3

x এর মান (1) নং সমীকরণে বসাই,

y=8-2××3 = 8-6 = 2

সুতরাং, x ও y এর মান যথাক্রমে 3 ও 2 (Ans)