Jack wasn’t saying anything,but the teacher smiled at him________he had done something very clever. (2011·湖南,33)
________by a group of children,the old man was delighted.
Learning English means _________ memorizing a huge lot of words.It involves a large amount of reading as well.
Tom as well as two of his classmates _____ invited to the party.
The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
My grandfather is always thinking for others. In another word, he is always ________.