There were dirty marks on hertrousers _______ she had wiped her hands.

It was only with the help of the local guide _____. [ ]

And then the________wind blew the roof off.-Oh，you must have been________.[ ]

Datou Ge Hongyu made few mistakes in the competition of singing, ________ — _____________. I think his perform was the most wonderful in The Voice of China.

Listen ! Helen is singing in the next room.It ____ be Helen. She has gone to Beijing.