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3. the deep tunnelling came(past indefinite active ) later, in 1890. tunnelling a tube through miles of clay, and sometimes sand and gravel is ( present form of "to be" active)no easy task, and it was ( past indefinite active ) james henry greathead who developed ( past indefinite active )the method which was ( past indefinite active )to make most of london's tube tunnels possible. london transport's experience with tunnels brought (past indefinite active )them another record. one of the longest continuous railway tunnels in the world is(present tense of" to be " active ) the 17 1/2 mile tunnel on the northern line. 4. there are ( present tense of" to be " active)numerous escalators which help ( present indefinite active )to keep the traffic moving. the first was installed ( past indefinite passive )in 1911. one of them at leicester square is( present tense of" to be " active ) over 80 feet in length. on long escalators the speed is( present tense of" to be " active ) changeable. hie "up" escalator runs ( present indefinite active )at full speed when carrying passengers, but when empty it runs ( present indefinite active )at half speed. many of the new escalators have( present indefinite active ) ) automatic control making a more frequent service throughout the possible.
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