First designated in 1970, Earth Day has become an annual international event ______ concerns about environmental issues such as pollution.

A. he already knows how to play.
B. he doesn’t like to play games.
C. he doesn’t have a partner.
D. he doesn’t have enough free time.

A. whether the Muslim Brotherhood is committed to democracy is doubted.
B. Brotherhood candidates won’t yield direct power in the presidential election.
C. Brotherhood have become the biggest opposition group in parliament.
D. candidates were officially allowed to stand as Brotherhood candidates.