Every possible means ______ to prevent the air pollution, but the sky is still not clear. 

Peter, as well as his two sisters Sondra and Emily, ____ left-handed.

The traffic is moving very slowly as so many cars   on their way back to Shanghai.

Either you or one of your students________ to attend the meeting that is due tomorrow.

---I saw Betty       to Grandpa Li's home just now.---Yes. She’s often seen _________ the old man with the housework.