Please allow me to express our________（热烈的欢迎) to all of you。

A、attempt to establish eye contact with him/her.

B、remind him/her of his/her last action before the interruption.

C、make sure there is no ATC traffic on the radio.

A、The more carefully; the fewer

B、The more careful; the less

C、The more carefully; the less

D、The more careful; the fewer

A、I'll arrive late, but please keep my reservation.

B、I'd like a room on the upper level.

C、I'll take this room.

D、Would you fill in this registration form?