He hurried to the booking office only ________ that all the tickets has been sold out.

—Can those ________ at the back of the classroom hear me?
—No problem.

Reading is an experience quite different from watching TV; there are pictures ________ in your mind instead of before your eyes.

—The last one ________ pays the meal.
—Agreed!

If water becomes increasingly scarce in decades ________，water shortage will become a hot issue all over the world.

If there is a lot of work ________， I'm happy to just keep on until it is finished.

To learn English well, we should find opportunities to hear English ________ as much as we can.

A cook will be immediately fired if he was found ________ in kitchen.

—Excuse me，sir, where is Room 301?
—Just a minute.I'll have Bob ________ you to your room.

To fetch water before breakfast seemed to me a rule ________.