PRESENT PERFECT OR PRESENT PERFECT CONTINUOUS

Robin: I think the waiter (forget) [?] us. We (wait) [?] here for over half an hour.

Michele: I think you're right. He (walk) [?] by us at least twenty times. He probably thinks we (order, already) [?].

Robin: Look at that couple over there, they (be, only) [?] here for five or ten minutes and they already have their food.

Michele: He must realize we (order, not) [?] yet! We (sit) [?] here for over half an hour staring at him.

Robin: I don't know if he (notice, even) has even noticed[?] us. He (run) [?] from table to table taking orders and serving food.

Michele: That's true, and he (look, not) [?] in our direction once.