There ____ lots of bad information that is not suitable for teenagers on the Internet.

There is ______ American boy in our class and ______ boy can speak good Chinese .

“Well done, John.！ Not a single mistake _____ in your exam paper this time！”said the teacher.

He was wearing a pair of sunglasses and I didn’t _____him at first.

Edison had more than 1,000 inventions his lifetime.[ ]