Rockets … for high altitude research are equipped with special instruments.
The acceleration of all… bodies is the same, independent of their size, shape or mass.
For … electrical energy into mechanical energy we use a special machine.
… the gas increases the speed of the molecules.
A switch is a device for … a gap in a circuit.
The … temperature of water is 100 degrees C.
Rutherford and Soddy worked out a theory… the phenomena of radioactivity.
The meeting will begin as soon as everyone …
They were very dirty because they … football in mud.
If only I … vocabulary thoroughly yesterday.
I insisted that the money … into my account immediately.
Helen… her nails done at present.
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