Sam some knowledge of the computer just by watching others working on it.
Mary is being punished by the teacher. That is _______ she broke the school rules.
By improving reading skills, you can read faster and understand more of ______ you read.
----That is ________ you spent your summer holiday, isn’t it? ---- That’s right.
Human beings are different from animals _________ they have languages.
At school, some students are active, ______ some are shy, yet they can be good friends with one another.