It’s usually a common _______ that journal websites offer readers their free online editions of articles and other information.

Please _________ the tigers. It’s dangerous to take photos with them.—Oh, I see. Thank you.

In summer, there is plenty of rain for the grass to grow.

did you go yesterday morning—1 went to our school library to read books on physics．

下列各组句子中，不含有通假字的一组是（ ）