A) сравнительная
б) превосходная
в) сравнительная
г) не существует
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<span>He had been writing books since he was a young man. 2. What have you been doing here since morning? 3. She has been helping her mother since morning. 4. He has been running for ten minutes without any rest. 5. They have been working there for three hours already. 6. I had been reading for about an hour when he came. 7. He had been teaching at school for five years when the war broke out.</span>
Do you always help your mother?
The boys are swimming in the river now.
When does your sister usually wake up?
Is he reading a book now?
<span>1) </span>Every machine-tool used in a machine
shop is designed for a special machining operation.
<span>2) </span>The life of the machine-tool depends
on the care given to it.
<span>3) </span>The cutting-tool is the part of the
metal removing machine.
<span>4) </span>There is a strict distinction
between the operations of boring and drilling.
<span>5) </span>Machining operations are applied for
the purpose of shaping many products.
<span>6) </span>The most important machine for
drilling products in metals is a drilling machine.
<span>7) </span>The new machine-tool testing is
needed.
<span>8) </span>This lathe can be used for the
production of a wide variety of parts.
<span>9) </span>???
<span>10) </span><span>The machine-tool is the principal
manufacturing equipment in a machine shop.</span>