Choose the answer that best fits each space.1.
We
saw our teacher ____the formula on the blackboard.
a)
write b) written c) wrote d)
have written
2.
The
lighting conductor ____to protect building from strokes of lightning.
a)
have
invented b) was invented c) had invented d) invented
3.
There
are ____kinds of energy.
a)
some b) much c) little d)
any
4.
Moving-iron
instrument has two ____: the repulsion type and the attraction type.
a)
pieces
b) means c) shapes d)
varieties
5.
This
machine ____at a high speed.
a)
is
operating b) have operated c) operated d)
had operated
6.
The
reactor ____energy in the form of heat.
a)
produce b) was produced c) is produced d)
produces
7.
It
was Faraday____ discovered electromagnetic induction.
a)
who b) which c) whom d)
whose
8.
The
lightning conductor ____buildings from thunderstorms.
a)
protect b) will be protect c) will protect d) protecting
9.
Alternative
methods of generating electricity ____ during last century.
a)
develops b) have developed c) has been developed d)
were being developed