1 . The differences the children’s achievements can not be completely explained ________ their social backgrounds.

A．in front of	B．in case of
C．in need of	D．in charge of

2 . The big snow lasted nearly half a week. What was worse, they were trapped in the mountain and badly ________ food.

A．in search of

B．in the hope of

C．in want of

D．in charge of

3 . _______ the school, the village has a clinic, which was also built with government support.

A．In reply to	B．In addition to
C．In charge of	D．In place of

4 . .At the ceremony, the president delivered a thank-you speech _____ the company.

A．on account of	B．in charge of
C．on behalf of	D．in terms of