When ______ comes to research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
A. that B. it C. this D. what
One of the best ways for people to keep fit is to ______ healthy eating habits.
A. grow B. develop C. increase D. raise
The building around the corner caught fire last night. The police are now ______ the matter.
A. getting through B. working out C. looking into D. watching over
A survey was carried out on the sleep time of students in middle schools, ______ were surprising.
A. its results B. whose result C. the results of which D. of which results
---Do you have ______ for the party, Mary?
---No, we still have to get another five chairs and some fresh flowers.
A. something B. everything C. anything D. nothing
Was it in 1969______ the American astronaut succeeded ______ landing on the moon?
A. when; on B. that; on C. when; in D. that; in
