Which coat is _______, the black one or the gray one– The black one, of course.

He’s been collecting stamps _ he was eight years old.

Your pencil case looks really beautiful.- . But in fact, Gina’s looks better than mine.

I am looking for information on social safety.—-You can take this book. Social safety is _______ introduced in it

Sir, a Mr. Wang is waiting for you at the gate. ________ he come in or stay there?