30. He thinks natural resources are endless, but I am afraid that they will used up.
A B C D
Read the passage and choose the best option to fill in each blank.
CU CHI TUNNELS
Cu Chi is (31)______30km from HCM City. It has an (32)______role during the two resistance
wars. It was underground village with a network of tunnels totalling (33)______than 200km.
(34)______main tunnel is from 60 to 70cm wide and from 80 to 90cm high. The tunnels are
approximately 3 to 4 m under a layer of earth able to sustain the weight of 50-ton tanks, heavy artillery,
and bombs of up to 100kg. The network is equipped (35) ______various accommodations from meeting
rooms to a medical clinic.
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