Vitamin D helps our bodies make a special chemical,and this special chemical, ____ , affects our brains,making us feel happy.
All the parents in Mianyang admire Nanshan Middle School the teachers are treating their students like friends.
People in Nome all had diphtheria, a disease that spreads very fast. If ________, it would produce a powerful poison that would kill the patient.
—Was the label ________your luggage?— No,it wasn’t.
they speak their own kind of English.
Mary is giving me English lessons my teaching her Chinese.