1. This app allows you to review your lessons by playing games,

2. We were cleaning up the beach when it started to rain.

3. Ecotourism provides tourists with opportunities to explore nature.

Today, people are producing too much waste leading to the fact that the city landfills are nearly full, rubbish is covering lots of rivers and lakes, which causes water and land pollution. To prevent this, we should recycle things like bottle, plastic appliances and papers. Reusing products instead of throwing them away is another method. Besides, we need to process the waste more carefully: sorting out kinds of waste for easy process, collecting organic trash to make fertilizers for plant. Furthermore, reduce plastic bags. You can use papers and leaves to wrap food instead or utilize organic bags which can be reused.

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