题目内容

【单选题】__________ the Internet of Things is to become a reality, its developers should pay more attention to its security.

A. If
B. Although
C. Until
D. Unless

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【单选题】Unlike many companies __________ services stops once the sale is made, our service begins once you buy our product.

A. what
B. whose
C. that
D. which

【单选题】While __________ the article, I was wondering whether e-books would replace print books soon.

A. reading
B. read
C. was reading
D. to read

【单选题】It was not until the 1990s __________ industrial robots became really cheap, and therefore a possible option.

A. which
B. who
C. whom
D. that

【单选题】When you finish __________ your questions, simply press the Enter key.

A. type
B. typing
C. to type
D. typed