I didn’t quite follow him because he explained the theory _____that is too abstract for me.
—The athletes won 51 gold medals in the 29th Olympic Games.—We are all __________ their success in the Olympic Games.
The waste can be recycled into new products, which __________ will save natural resources.
Tony __________ the deadline by two hours, but did not inform me __________, which made me angry.
There's a __________ in our office that when it's somebody's birthday, they bring in a cake for us all to share.
__________, the little girl could speak English so well.