Air pollution is now considered/thought/said/believed to be the world's largest environmental health threat, accounting for 7 million deaths around the world every year.

Defining Relative Clause

A lost the sunglasses  (that) I bought at the weekend.   objective

I like tea that comes from China.

I like the book that was written by my uncle.   I like the book written by my uncle.

there are many books ( that have been) written by students

there are many books ( that ) students wrote     

repeat offender

to serve time in prison

longer sentences

juvenile deliquent 

jail, prison , correction facility

inmate    

I will be talking about ...

I will pose a question ...

What makes a business successful?

entrepreneur in tech or science

- financial support and IT support (partners), apply for a bank loan   

- clear (business) plan, objectives

- employ great staff (educated, qualified, loyal)

- unique idea

- great leadership

- the ability to bear the risk ( risk taker) 

- understand the market

- research your competition

- in demand (supply and demand)

- patient, be able to cope with stress