I have not seen him ______ he left

at kind of drink would you like,coffee or orange We can also use ____ instead of the underlined word

Sir， can I pass the examinations this time？—That depends on　　　　you work hard enough or not.

下列各句没有语病的一项是（ ）

science has found that _______ one is using chopsticks, over 30 joints and over 50 muscles are used, which is a favorable stimulation to the brain.