Tara often helps her mother_____________at home on weekends.

His ability has never been in doubt—-the question is___________ or not he is prepared to work hard.

If no one ________ the lost bag，the person who found it can give it to the Lost and Found Department.[ ]

The World Food Prize, created in 1986, is _______each year to people who have advanced human development by improving the quality, quantity or availability of food in the world

She stepped on my foot _______, not _______, which made me angry