Sometimes smiles around the world ________ be false, hiding other feelings like anger, fear or worry. [ ]

is very difficult for us to learn English well because is a quite difficult language.

Interviews were carried out ________ over the telephone，via e－mail or fax or face to face in four cities including Beijing，Shanghai，Guangzhou and Wuhan

If your knowledge can be in some way __________ with my experience, we are sure to succeed.[ ]

There are ninety teachers in our school. _____ of them are men.