—Bob, look what you have done! You ruined the experiment.—It’s not my fault. I just carried out the instructions _____.
Slowly but surely, the city_________a successful one_________of its cultural diversity.
These years China_______a boom in scientific and technological development.
.—Have you finished the work? —Not yet. I _____ to do it just a moment ago.
—How often do you go home to see your parents? —___________, but usually once a week.
_____more and more forests destroyed, some animals are facing the danger of dying out.