21. Learning country’s language is a better way of knowing culture behind it.
A. a/the B. the/a C.不填/the D. a/不填
22. Every person needs water and a diet of healthy food ______some fat, some fibre and a little salt .
A. gaining B. containing C. keeping D. including
23. He apologized ________ late.
A. to his teacher to arrive B. at his teacher for arriving
C. at his teacher to arrive D. to his teacher for arriving
