WHISTLING AND _________ IN A RESTAURANT IS CONSIDERED TO BE IMPOLITE AND EVEN RUDE

10. - ON THI TRAC NGHIEM TIENG ANH 12BAM SAT
ON THI TRAC NGHIEM TIENG ANH 12BAM SAT

10. Whistling and _________ in a restaurant is considered to be impolite and even rude.

A. talking B. clapping hands C. smiling D. sighing