填入一个适当的词补全对话，每空一词。

A: Hi, Mom. Could I go to the cinema with Grace tonight?

B: No, you . Your grandparents are coming over for dinner tonight.

A: Oh, I want to see them! Hmm. . . could I at go out with Grace now?

B: Yes, as long as you promise to come back early.

A: OK, Mom! Oh, are they arriving?

B: At about 6:00 p. m. and I need you to help me in the kitchen.

A: OK! I'll be back of them.

B: Sounds great. See you! be late!

A: Bye, Mom!