My mobile phone disappeared. Where _____ I have left it?
David likes country life and has decided to _____ farming.
The simple joy of reading is something we take for granted. But many people have had to _____ this pleasure because of poor eyesight.
Please make sure the light will _____ if no one is in the room.
It is a pity that the quarrel _____ their friendship.
---Will you walk a little faster? ---I was afraid you could not _____ .