593.A strong earthquake ____ widespread destruction in the city center hit New Zealand South Island city of Christchurch.

A.caused
B.cause
C.causing
D.having caused

594.After playing in the park for a few hours,the pupils gathered under trees _______shade and ______ down to eat their picnic lunch.

A.provided;sit
B.providing;sitting
C.providing;sat
D.provided;sat

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