Whether ways will be found to stop pullution or not is just ________ worries the public.
A．why B．which
C．that D．what
I would appreciate ________ you could give me some advice on learning English.
A．it whether B．it if
C．that when D．that if
The local Tibetans and Sherpas laughed at the strange bottles containing ________ they referred to as “English air”．
A．which B．that
C．how D．what
The decision was made ________ more medical teams would be sent to help people in the earthquake.
A．what B．which
C．that D．when
Mobile phone users have developed a series of symbols, such as and to show ________ they feel.
A．which B．when
C．how D．why
Inside the White House, there is a room called the Oval Office. That's ________ President Obama works.
A．why B．where
C．what D．how
