— Hi, Jack, would you like to join us in the sightseeing this weekend?—Thank you, but I regret ______ you that I can’t, for I’m going to visit my grandparents.
Instead of using it at war, scientists are turning to research into the use of nuclear power for__________ purposes.
Devotion and selflessness are the __________ it takes to become such great people as Norman Bethune and Nelson Mandela.
Life is full of troubles and sufferings. Just remember, keep a positive __________ and good things will happen.
This is the first time that I_________ at the meeting.
Hurry up ! The train____ . There is only ten minutes to go.