Having never met with such a _____ problem, he felt _____ and didn’t know how to solve it.
| A．puzzling; puzzled | B．puzzled; puzzling |
| C．puzzling; puzzling | D．puzzled; puzzled |
The chairman thought _________ necessary to invite Professor Smith to speak at the meeting.
| A．that | B．it | C．this | D．him |
. It was not until nearly a month later _________I received the managers reply.
| A．since | B．when | C．as | D．that |
---- What do you think of the book? ---- Oh, excellent .It is worth __________ a second time.
| A．to read | B．to be read | C．reading | D．being read |
. Such animals like dinosaurs died out because they could not _________ to the change of the climate.
| A．suit | B．keep | C．adapt | D．switch |
If you get up early and run every day, it will ______________ you.
| A．benefit from | B．be of benefit | C．be beneficial to | D．benefit to |