1. We thought there were 35 students in the dining hall, __________, in fact, there were
40.
A. however B. what C. which D. while
2. Such signs __________we use in the experiment __________Greek letters.
A. as; are B. as; is C. that; are D. that; is
3. This book is for the students___________ native language is not English.
A. their B. of whom C. whose D. of whose
