The girl wearing a pair of dark glasses comes from a city in South China, ______ is evident from her accent．

A．who

B．that

C．where

D．as

She was so angry and spoke so fast that none of us understood ______ he said meant．

A．that

B．what

C．that that

D．what what

Some people are bad at recalling names and faces, so it's possible that they have a condition called face blindness, ______ people suddenly have trouble recognizing family members, friends or even themselves．

A．for which

B．which

C．where

D．of which

As a student in Senior Three, I must work hard．______, I should take exercise to strengthen my body．

A．Otherwise

B．Meanwhile

C．Therefore

D．Thus