Karen couldn’t________ her mind whether to apply for membership or not.

Team leaders must ensure that all members ______their natural desire to avoid the embarrassment associated with making mistakes. 

After the heavy mudslide happened in Sichuan, hundreds of newspaper reporters were sent to ____ the natural disaster.

The air is deadly polluted because some factories don’t    __the rules to protect the environment.

The two Chinese scientists have made a wonderful discovery, which marks a major _______ in the basic research in the field.