The warning we were given as children ________ an apple a day keeps the doctor away may,in fact,have a scientific explanation.
27.---Mary, you didn’t show up at the meeting last week? ---No, I________, but my son had a sudden fever and I had to stay at home to take care of him.
26.Newly-developed materials for spaceships can______extreme weather conditions.
25.James Williams is my favorite professor; his speech is always brief, clear and_____the point.
24.The first time I met David in the Central Park, both of us felt that we_____each other for ages.
23.---How much do I owe you for this beautiful vase? ---_____.It’s a gift.