The manager has to get all these washing machines______________.
_________ many times, he finally understood it.
The chairman thought _________ necessary to invite Professor Smith to speak at the meeting.
It was not until nearly a month later _________I received the managers reply.
---- What do you think of the book? ---- Oh, excellent .It is worth __________ a second time.
Such animals like dinosaurs died out because they could not _________ to the change of the climate.