21. — Never forget to give Miss Black the message that there will be a meeting tomorrow afternoon.

— I won’t; I’ll tell her ________ I see her.

A. suddenly    B. directly       

C. lately        D. quickly

22. —Why were you late for such an important meeting?

— The plane arrived at the airport after a ________ of two hours.

A. rest  B. request  C. delay  D. trip

23. They always believe ________ the famous expert says about this project.

A. whatever      B. no matter what  

C. however      D. no matter how