We shall not start the project until it __________ by the committee.

I will buy this type of car _____ the price is brought down to under 10,000 dollars

It is said that the temperature is unusual mainly _______ global warming caused by human activities

Oh, Mrs. Liu, your necklace looks nice. Is it new — No, I ____ it for two years.

ave me so much help, without ____ I couldn’thave succeeded last year．