$\text{1. The }$$\color{red}{fewer}$$\color{green}{⇒less}$$\text{ furniture that you have in your bedroom, the bigger it will look.}$
$\text{2. Renewable energy is a practical solution }$$\color{red}{of}$$\color{green}{⇒to}$$\text{ our electricity needs. }$
$\text{3. By increasing renewable energy, we can reduce air pollution and }$$\color{red}{cutting}$$\color{green}{⇒cut}$$\text{ global warming emissions. }$
$\text{4. In six years' time, we will be }$$\color{red}{travelled}$$\color{green}{⇒travelling}$$\text{ across town by flying taxi. }$
$\text{5. People from the countryside move to }$$\color{red}{city}$$\color{green}{⇒\text{the city}}$$\text{ to find work and a better standard of living.}$
$\text{6. When you were a child, you used to go to school on foot, }$$\color{red}{weren't}$$\color{green}{⇒didn't}$$\text{ you ?}$
$\text{7. Friday night, a friend of }$$\color{red}{our}$$\color{green}{⇒ours}$$\text{ from college came up to see us.}$
$\text{8. Another Japanese city, Osaka, also has a very large population }$$\color{red}{with}$$\color{green}{⇒of}$$\text{ 20.5 million.}$