21.— I’ll come to attend your lecture at 10 a.m. tomorrow.
---- I’m sorry, by then my lecture will have ended and I ____ my guests in my office.
A. is being met B. will meet C. will be meeting D. will have met
22. _____ , I think, and the problem could be settled.
A. If you make your efforts B. So long as you keep your spirits
C. A bit more efforts D. making great efforts
