---There is somebody knocking at the door. Who________ it be?---I’m not sure. It ________ be a postman.
—_________ is the baseball? —It’s on the sofa.
—Is this your dad? —No,________. That’s my uncle.
—My name is Lingling, __________ my English name is Carla. —Nice to meet you, Lingling.
—Betty, is that Linda’s sister? —Yes, it’s __________ sister.
—Excuse me, how do you __________ “basketball”? —B-A-S-K-E-T-B-A-L-L.