Sometimes parents find ______ hard to communicate with their children.

Excuse me. Can you please tell me ______?　 —Sure. There’s a bookstore on River Road.

Will your younger brother go for a picnic this Sunday?— If I don’t go, ________ .

─ Look, Stella is there!─ That ______ be her. She doesn’t like singing.

How____ shall I take the medicine?—Once a day. [ ]