In Copenhagen Climate Conference，rich countries promised to________a fund of $ 100 billion a year by 2020 to help developing countries.[ ]

raininghard for 3 hours without stopping.

Does Susan often come late to school—-Seldom,_______.

Sheaskedmetohelpher,___________thatshecouldn’tmovetheheavysuitcasealone.[ ]

The contract is very important for both of you, so studying it________before signing is necessary.[ ]