A. reproducingB. waitingC. hidingD. disappearing

A．growingB．increasedC．reducedD．disappeared

A．squareB．farewellC．declareD．disappear

Im sorry to keep you______for a long time.A．to waitB．waitingC．waitedD．to waiting

______(47)A. The delta rhythm will disappear to b

______(48)A. The delta rhythm will disappear to b

______(49)A. The delta rhythm will disappear to b