You can us in the discussion if you ．

A.
take part in; hope so
B.
join in; want to join
C.
attend; want to
D.
join; wish to

experiment took as long as five months and turned out great success.

A.
The; /
B.
/; a
C.
The; a
D.
The; the

Advertisements are powerful and some companies try to mislead us, so we ________ be careful when reading them.

A.
can
B.
may
C.
must
D.
would

Bicycles have been around in our life for more than hundreds of years, but no one knows who ________ the first bicycle.

A.
invented
B.
had invented
C.
has invented
D.
would invent

High-speed trains travel at 300 kilometers an hour，which is about normal trains．

A.
four times the speed as
B.
the speed four times of
C.
four times as the speed of
D.
four times the speed of

Last Sundlay, my cousin sent me an e--mail, ________ me to his birthday party.

A.
invited
B.
inviting
C.
to invite
D.
having invited

The cloud never hides the sun．The truth will be known to all ________．

A.
on time
B.
in time
C.
by time
D.
from time to time

You ________ drink it; it is poisonous．

A.
can't
B.
needn't
C.
may not
D.
mustn't

One ought _______ for what one hasn’t done

A.
not to be punished
B.
to not be punished
C.
to not punished
D.
not be punished

The old movie reminded them ________ the wonderful time they had spent together．

A.
to
B.
for
C.
in
D.
of

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