1. The Indigenous people (　　) a tradition of respecting nature.
(A) bulge (B) ruffle (C) uphold (D) compensate
2. Is your friend (　　 ) enough to keep it a secret?
(A) secular (B) discreet (C) restless (D) gestational
3. They met each other at the right time and right place by pure (　 　 ).
(A) blast (B) burden (C) confession (D) serendipity
4. Brian still felt (　　) of homesickness for his family and friends.
(A) pangs (B) caves (C) regimes (D) tortoises
5. Connoisseurs can (　　) between genuine gems and fake ones.
(A) confer (B) demolish (C) reiterate (D) differentiate
6. The latest world’s fair (　　) off earlier this month.
(A) racked (B) kicked (C) ticked (D) chucked