21. Without____ thorough understanding of China’s specific conditions, you can’t have ____ say over the only-child policy.
A. a; the B. the; a C. a; a D. the; the
22. The selfless village doctor treated whoever came to his family without any _____.
A. cost B. charge C. payment D. price
23. –The battery in my cell phone is running low.
–I _____that last night before we went to bed.
A. was noticing B. have noticed C. would notice D. had noticed
24. I don’t think ___ of his parents are home. They usually go out for a walk at the moment.
A. one B. any C. either D. both