I think _________ of the materials I listened to at the beginning of the exam __________ easy.
When ______ comes to research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
_________ volunteers will give out leaflets to ask people to protect the wetlands.
I hope you _______ to my party next Sunday.
Does it often rain in Jinan? -No,was little rain in Jinan last winter.