Whenever I met her, ______ was fairly often, she greeted me with a sweet smile.
A. who B. which
C. when D. that
It's helpful to put children in a situation ______ they can see themselves differently.
A. that B. when
C. which D. where
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
