Not until late 1960s______ on the moon.
A.that Americans walked
B.did Americans walk
C.when Americans walked
D.when did Americans walk

Oxfam tries to send food to countries where people are suffering malnutrition.
A.by
B.of
C.for
D.from

number of boys were swimming in the lake, but I didn’t know exact number of them.
A.A/the
B.A/an
C.The/the
D.The/an

Never before such a severe flood in this mountainous area.
A.do I see
B.I have seen
C.I had seen
D.have I seen

With what my parents prepare for me in terms of education, I am about my future.
A.confide
B.confident
C.confidence
D.confidential

Peter has been studying for almost three years and he will have this degree and return to his country in six months.
A.others
B.the other
C.other
D.another

you like what I want to do or not, you won’t make me change my mind.
A.Because
B.Whatever
C.If
D.When

Geometry is the branch of mathematics_____ the properties of lines, curves, shapes, and surfaces.
A.that concerned with
B.it is concerned with
C.concerned with
D.its concerns are

A.assistance
B.appearance
C.position
D.confidence

A.campus
B.plane
C.game
D.base