—What happened to the priceless works of art?—________.
Remember to ________ the pockets before you put the trousers in the washing machine.
It is the first time that I ______________ such a beautiful scene.
The policeman asked ________ with the old woman.
The task requested _______ did it _______ careful and brave enough.
As is known to all language learners, the newly learnt words will soon be forgotten unless _________ used in everyday communication.