Nobody knows ____.A .what wrong is.B .when did he come back.C .if Kyle will play the solo.
His close friend _____ for two years.
Don’t be lazy,_____ you will fail the exams.
When we went into the park, we saw someone _____ Chinese Kungfu.
Xiao Li had an accident yesterday _____ he is in No.1 People’s Hospital now.
—Lily, _____ you _____ your ticket? —Not yet!