Commercial letters of credit are often used to financing export trade, but they have other uses.
A.are
B.financing
C.export
D.other uses

_________(51)
A.causes
B.results
C.leads
D.invents

_________(53)
A.manner
B.approach
C.custom
D.style

_________(54)
A.crosses
B.refuses
C.breaks
D.cracks

_________(56)
A.fixed
B.joined
C.built
D.placed

A.cook
B.hook
C.foot
D.food

A.arranged
B.naked
C.cleaned
D.repaired

A.aviation
B.particular
C.considerable
D.environment

There's no point in persuading him to do this.
A.He is able to do this although he does not want to.
B.It would be useful to persuade him.
C.It is useless to persuade him to do this.
D.I enjoy persuading him to do this

It would be a waste of time if you ask Jack to lend money.
A.It is not worth asking Jack to lend money.
B.There is no point in asking Jack to lend money.
C.It is no good asking Jack to lend money.
D.It is not good when asking Jack to lend money.