When will the 70th anniversary ceremony for our school ________? All the students and teachers are waiting for it.— Well, in my opinion, at 9 am.[ ]

The businessman boasts to me that I can’t find a ________ gold necklace，because his shop deals in the best.

Bicycling is good exercise; ____, it does not pollute the air

The boy was so careless that the glass fell from his hand and it _____ on the floor.

I usually have a small bowl of noodles ____ breakfast.