The policeman warned the tourists not walking alone in empty streets at night.
not walking => not to walk/ against walking. cảnh báo ai không làm gì dung1 trong 2 công thức: 1. warn sb not to do sth 2. warn sb agaisnt doing sth
Many people object to use physical punishment in dealing with discipline problems at school.
My brother usually /ask me for help /when he /has difficulty with his /homework.
Animals like frogs #have waterproof skin #that prevents #it from drying out quickly in air, sun, or #wind.
All types of dinosaurs went extinct long time ago.
More complex animals gradually evolved from these very simple creatures.
Many birds didn't survive the severe winter.
Do you realize that by this time next week we have been in Paris?
Rare animal extinction is one of the ______ things that could have happened.
Living in a big city isn't ____ interesting as I thought it would be.
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