阅读下面短文，从短文后所给各题的四个选项([A]、[B]、[C]和[D])中选出能填入相应空白处的最佳选项，并在答题卡上将该项涂黑。
36．[A]being perched [B]perching [C]being perching[D]be perched
37．[A]gathering [B]assembling [C]waiting [D]forming
38．[A]to south [B]the south [C]to southwards [D]south
39．[A]great number of [B]a great deal of [C]plenty of [D]numerous
40．[A]feed [B]are fed [C]eat [D]rely
41．[A]near [B]about [C]nearby [D]over
42．[A]too [B]a bit [C]very [D]much
43．[A]fly off [B]swoop [C]settle [D]turn back
44．[A]practical [B]practicing [C]practice [D]practised
45．[A]in advance [B]ahead of [C]in front of [D]in front
46．[A]Swarms [B]Herds [C]Flocks [D]Schools
47．[A]firmly [B]stoutly [C]harshly [D]steadily
48．[A]until [B]before [C]when [D]as
49．[A]in the way [B]on the way [C]half the way [D]all the way
50．[A]take [B]fly [C]find [D]make
51．[A]old [B]original [C]familiar [D]identical
52．[A]before [B]previous [C]ago [D]former
53．[A]way [B]path [C]course [D]route
54．[A]why [B]when [C]how [D]what
55．[A]against [B]away [C]for [D]with
