People have lots of problems living in the central Australian desert, ____ the lack of water is the most serious one.
| A．of which | B．which | C．for which | D．where |
The girl has a great interest in sports and ___ badminton classes twice a week over the past 2 years.
| A．takes | B．took |
| C．is taking | D．has been taking |
The how-to book is of great help to ____ wants to apply for the job.
| A．who | B．whoever |
| C．no matter who | D．whomever |
I sent you 100 dollars today, the rest ____ in a year, because I’m also in debt.
| A．follows | B．ones | C．those | D．one |
It is said that Nigeria is ____ Great Britain.
| A．three times larger of | B．the size three times of |
| C．three times as the size of | D．three times the size of |
On average, the footprints discovered are 14 to 18 inches long, 5-9 inches wide and much larger than ____ of a human.
| A．that | B．ones | C．those | D．one |