Volunteering to clean up the beach has a significant _______ on the ecosystem.



In the most of cases, cutting down trees is bad for the environment. 

In mostly cases, cutting down trees is bad for the environment 

In most cases, cutting down trees is bad for the environment.

In most of cases, cutting down trees is bad for the environment. 

Which sentence is grammatically correct?



 "My colleagues that is based in USA are working remotely."

"My colleagues that is based in USA is working remotely."

"My colleagues that are based in USA are working remotely."

"My colleagues that are based in USA is working remotely."

What sound does the first "t" in the word "Situation" make? 

Volunteering to clean up the beach can significantly _______ the ecosystem