The teacher asked me if I knew _______ the machine.
A.how to operate
B.to operate on
C.operating
D.how operating

The problem _________ at the meeting tomorrow is very important.
A.discussed
B.to discuss
C.being discuss
D.to be discussed

Jack spent his money as if he _________ a lottery.
A.won
B.had won
C.has won
D.wins

Scientists cannot agree on __________ related to other orders of insects.
A.that fleas are
B.how fleas are
C.how are fleas
D.fleas that are

The boy pretended to be ill _________ to work.
A.in order not to be made
B.to avoid making
C.so that he is not made
D.for not being made

She loved staying in the cottage, ............................
A.as her friends who visited her there were
B.as were her friends who visited her there
C.as did her friends who visited her there
D.as her friends did who visited her there

I will call you before I ________ over.
A.come
B.will come
C.will be coming
D.came

He ran away ____________ he might be seen.
A.so
B.lest
C.so that
D.although

________ begin their existence as ice crystals over most of the earth seems likely.
A.Raindrops
B.If raindrops
C.What if raindrops
D.That raindrops

I can’t decide when ________ .
A.I was leaving
B.leaving
C.left
D.to leave