Choose the correct words to complete the sentences.

1 Millions of tons of plastic throws / are thrown away every single day.
2 People throw / are thrown away too much rubbish.
3 Many stars are formed / were formed billions of years ago.
4 The world’s highest mountains find / are found in Asia.
5 Scientists believe / are believed that there will soon be more plastic than fish in the ocean.
6 The first plastic invented / was invented in 1907.
7 Many people waste / are wasted lots of electricity.
8 Too many trees cut / are cut down every year.
9 I stopped / was stopped by a police officer who wanted to ask me some questions.