The word “it” in line 17 refers to ____________________. A. square meter B. the Sun’s energy C. latent heat D. the atmosphere

I usually _ _  jogging around the park every morning.

Put a tag question at the end of the sentence: In big cities, life can become very difficult and unpleasant, _________?

The exact cost of the whole venture isn't known yet, but our best accountants have been trying to _____ it out. 

Write about your partner's eating habits. Include information about his/her meals, your opinion about his/her eating habits and possible changes.

I didn't buy it because I didn't have enough money.

=> If ______________________________.