_ is certain is __ the mystery of Stonehenge has never been fully explained.

A.
It, that
B.
What, what
C.
It, what
D.
What, that

Two years ago I broke my arm ____ football.

A.
when playing
B.
while played
C.
played
D.
having played

---I need to advertise for a roommate for next term.
---_______? Mary is interested

A.
What for
B.
Why not
C.
So what
D.
Why bother

Tom was ____ a happy childhood, most people would like to have.

A.
filled with; one
B.
blessed with; one
C.
covered with; which
D.
laden with; which

It’s ten years since the scientist _______ on his life’s work of discovering the valuable chemical

A.
made for
B.
set out
C.
took off
D.
turned up

Three minutes earlier ____ we could have caught the early train to Philadelphia.

A.
or
B.
but?
C.
and
D.
so

The death of Kim Jong I1 was great surprise to the world and it is reported that he died while he was traveling to inspect somewhere in flesh.

A.
the; a
B.
不填; a
C.
a; 不填
D.
a; the

—I have tried very hard to find a solution to the problem, but in vain.
—Why not discuss with Frank? You see, _________.

A.
two heads are better than one
B.
a bird in the hand is worth two in the bush
C.
it’s better to think twice before doing something
D.
great minds think alike

__________ the reason , research shows that laughter is good for your health.

A.
Whatever
B.
Whenever
C.
Whichever
D.
However

________________ invited, I won’t go traveling with them because I’m busy these days..

A.
Apart from
B.
In spite of
C.
Even if
D.
Only if

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