Scientists say it may be five or six years ______ it is possible to test this medicine on human patients.

The twins didn’t go to the theatre, they ______ the light music all night.

What else do you want for the dinner?—else. I don’t think I can eat more.

________ have you been away from your hometown, Janet?——Since 5 years ago.

Who is ___ English teacher?—Well, it’s Mrs. Green. She teaches ____ English very well.