The insurance shall be （） from the time of the engineer’s departure from China up to the time of his arrival in China on return.

单项选择题Your order will be delivered on October 15 （） you requested.

A.like
B.since
C.as
D.when

单项选择题（） the unforeseen difficulties on the part of the suppliers, we regret being unable to ship the goods within the time limit of your L C.

A.Owing to
B.As
C.Because
D.Since