13. We have pleasure in enclosing a copy of our latest catalogue ____ for in your letter dated December 11.
A.ask
B.asks
C.asked
D.asking
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14. All the shipping space for June shipment____ , we can not but ask you to extend the date of shipment till July 31, 2012.
A.booked up
B.to be booked up
C.being booked up
D.book up
107.As agreed upon in our negotiations, payment ____ L/C.
A.by
B.is by
C.will be
D.will by
108.In our letter of July 1, we make ____ clear that shipment be effected in March.
A.them
B.you
C.us
D.it
109.The 505 Vital Herb Pad, our new product , is based on a ____ concept.
A.traditional
B.newest
C.old
D.excellent