Many students enjoy the book about Harry Potter _____ by JK Rowling.
When you take a plane, you_______ obey the rule to turn off your cell phone.
He was stopped when he tried to_______ on the queue.
My English teacher is very knowledgeable_______ she has been to many countries.
- What do you think of the traffic in our city?- It's_______ than it used to be, but there's still a long way to go.
Children are often warned_______ with fire.