— Jack, this is the third time that you have been late this week.— Sorry, sir, but I was ______ for 15 minutes on the way here in the traffic jam.
—What caused the party to be put off? —__________ the invitations.
There are lots of places of interest__________in our city.
The Space Shuttle Columbia broke into pieces over Texas as it returned to the earth on February 1,2003,__________all seven astronauts aboard.
—Tom enjoys__________basketball on Sunday afternoons,doesn’t he? —Yes,he does.But what his sister enjoys__________.
__________from the appearance,it is very peaceful;but in fact,a war will break out soon.