_______ by a great demand for environmental-friendly cars, those factories has produced more green ones.
Mary is always ready to do some __ work at the local geracomium(敬老院)in her spare time.
Many experts stick to the view _____ teacher development is the key to the education quality.
When I wanted to express my thanks to him,words ___ me. I just held his hands firmly and choked.
Don’t worry. Intelligent students can always _______ good solutions to problems.
Nowadays children have to take arts, music and sports classes in their free time ____ busy schoolwork.