—What do you think of the songs? —In fact, ________ of them sounds beautiful.

The teacher gave the books to all the students except       who had already taken them.

The chairman thought ___ necessary to invite Professor Smith to speak at the meeting . 

Haze (雾霾)appears around us. Let’s do ________ helpful to protect the environment.

Jenny, the new comer, has earned not only the trust of her classmates but also ______ of her teachers.