A.Was built
B.Building
C.To have built
D.Built

A.therefore
B.but
C.moreover
D.besides

A.beneficial
B.costly
C.valuable
D.worthy

A.would have joined
B.will join
C.had joined
D.would join

A.collect
B.gather
C.achieve
D.master

A.
B.
C.
D.

A.\(25\,cm\)
B.\(50\,cm\)
C.\(80\,cm\)
D.\(100\,cm\)

A.
B.
C.
D.

A.
B.
C.
D.

A.
B.
C.
D.