—I can’t find my mobile phone. I’m sure it’s in this room.—____________. I’ll call you with my phone. When it rings, you can follow the sound.
—________ will your father be back?—My father will be back in half an hour.
Old people should ________politely.
—What happened ________Sarah? —She failed in the English test.
Several ________ students came to the meeting.
This book is ________for a six-year-old child to read.