________  in thought, he almost ran into the car in front of him.   
#90193
A
Losing
B
Havinglost
C
Lost
D
Tolose
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________the working efficiency,the boss allows the employees to have a coffee break.
#88719
A
Improving
B
To improve
C
Having improved
D
Improved
_________ the stomachache, he couldn’t fall asleep.
#95334
A
Suffered from
B
Suffered
C
Suffering from
D
Suffering
There is nothing interesting   at present.
#97792
A
go on
B
going on
C
to go to
D
goes on