1.We can never expect__________ bluer sky unless we create less polluted world.
A. a; a B. a; the C. the; a D. the; the
2.The new product is said _________. It is of good quality.
A to test out B to be tested out
C to have been tested out D having been tested out
3.He is a strict but kind teacher, _______, in my opinion, my son loves and respects.
A. one B. he C. which D. that
