Seeing the chemical ________ to the sunlight, Mr. Leewarned the workers to be careful when dealing with it.

_____sustainable development, measures are being drafted to control rising prices[ ]

1He is ______ calmer thanus.

I hope Bob won’t_______ my invitation. How I wish he could come to the party!- It’s hard to say. He left his plane ticket at home when he went to the airport last time.

Mom, my classmates invited me ________ a field trip. May I go with them —OK.