________ (令学生失望的是), the books they needed were sold out at the bookstore.

What will happen if the duplicate copy of the letter is not returned by the deadline？

This offer will be _____________ on that date.

Peace and development are the main themes of the times，an era full of both hope and challenges．

A)和平与发展是时代的主题，这个时代既充满希望，也充满着挑战。

B)和平与发展是时代的主题，这是个充满希望与挑战的时代。

C)多次讨论和平与发展这个主题，讨论充满了希望和挑战。

D)时代的主题是和平与发展，同时这个时代充满了希望和挑战。

Beijinghasannouncedthat____________(在任何情况下，中国将不首先使用核武器).

______(和其他同龄的孩子相比), Robert is very tall.

______(正如我们所期待的那样), the program went smoothly.