You’re welcome to _______ in the Art Festival ______ in my campus next weekend!

The bad weather made ____ difficult for the birds ______.

The poor peasant seized him ______ the leg, _______.

You’ve made Jenny _______, so you must be careful when ________ her.

___ H1N1 flu from spreading, our government has taken some effective measures.

_______the room，I found my cat lying on the floor，dying．

The fat woman sat at the table, her eyes _____ on the rich food on the plates.

The professor devoted all his life ____the treatment of AIDS．
A to research           B．in researching C．to researching   D．at researching

The experts are trying to find ways of ____ the animals in danger.

We saw many students playing on the playground, most of them _____ girls.