It’s exactly ______ we do ______ has changed the world.
| A．which; that | B．how; that | C．how; what | D．what; that |
It is uncertain side effect the medicine will bring about, although about two thousand patients have taken it.
| A．that | B．what | C．how | D．whether |
The experiment shows that proper amounts of exercise, if regularly, can improve our health.
| A．being carried out | B．carrying out | C．carried out | D．to carry out |
I guess we’ve already talked about this before but I’ll ask you again just .
| A．by nature | B．in return | C．in case | D．by chance |
The settlement is home to nearly 1,000 people, many of left their village homes for a better life in the city.
| A．whom | B．which | C．them | D．those |
Many lifestyle patterns do such great harm to health that they actually speed up
weakening of the human body.
| A．a; / | B．/; the | C．a; the | D．/;/ |