—Shall I lock the lab now before I go home?

—________.I'll check it myself later.

A．Go ahead

B．No problem

C．No hurry

D．Don't bother

They asked me to have a dinner in an excellent restaurant with them, I said that it was at least five

years since I _______ a good meal.   [ ]

A. was enjoying    

B. enjoyed      

C. had enjoyed    

D. had been enjoying