Mark drives his car too fast and, what's more, very carelessly, ________ worries his mother.
A．a B．what
C．it D．which
Occasions are quite rare ________ I have the time to spend a day with my kids.
A．who B．which
C．why D．when
The three backpackers finally reached the top of Mount Huangshan, ________ they could enjoy the breathtaking sights to their heart's content.
A．when B．where
C．why D．how
Europe has achieved more in controlling the AIDS virus than Asia in the past ten years, ________ the number of people infected with the virus is going up sharply.
A．when B．that
C．so that D．where
With the development of agriculture, the people ________ village I taught are now living a happy life.
A．in whose B．whose
C．in which D．which
The archaeologists found gold coins and pottery in the lowest level of the site ________ they reached three months ago.
A．what B．for which
C．that D．to which
