The new trains have more powerful engines and are; _________, faster.
A.therefore
B.however
C.nevertheless
D.nonetheless

The sea was dangerous, _________we didn't go out for a swim.
A.since
B.but
C.so
D.as

There is still much to discuss. We shall, _________, return to this item at our next meeting.
A.therefore
B.moreover
C.although
D.so that

Older people_________ a large proportion of those living in poverty.
A.comprise
B.consist
C.compose
D.compound

A.secure
B.vacant
C.oblige
D.equip

They made an aerial survey; that is, they made a survey_________.
A.by ship
B.by plane
C.on foot
D.by telescope

Hummock grasses grow in loose sand on the crest.
A.side
B.bottom
C.top
D.inside

A.roughly
B.tough
C.enough
D.though

A.area
B.arise
C.arrange
D.arrive

A.circle
B.center
C.census
D.cancel