Question 1(A) have developed(B) are developing(C) develop(D) developed

22. Question 2(A) believe(B) believing(C) believed(D) to believe

23. Question 3(A) they(B) them(C) themselves(D) their

24. Question 4(A) it(B) why(C) they(D) which

25. Question 5(A) preventing(B) allowing(C) making(D) causing

26. Question 6(A) more health(B) less healthy(C) the most healthy(D) healthier

27. Question 7(A) To eat(B) Eats(C) Eating(D) Eat

28. Question 8(A) increase(B) rise(C) grow(D) speed