High unemployment _____ the government billions of pounds in lost taxes.
Will was lying on the grass, _______the sky thick with stars.
The teacher, along with 5 of her students, ________talking with a foreign teacher in the English Corner at that time.
Gaining the knowledge ________ environmental protection will help you to become a qualified environmentalist.
— Try not to work yourself too hard. Take it easy.— Thanks. __________
— We have to stop talking here outside. Listen, ________!— Hurry up, or we’ll be late.