We work together to achieve our common purpose： ________ world that is safer， cleaner and healthier than ________ one we are living in.

________in a heavy traffic jam in a taxiwhile you are hurrying to the airport is quite an unpleasant experience．

If the weather had been better, we could have had a football match. Bit it ____ all day.

He jumped into the water when he heard a boy for help.

If you ____ do as I tell you , you ____ go to the party .