1.Mr Smith _____ a scientific novel last summer.But I wonder

1.Mr Smith _____ a scientific novel last summer.But I wonder whether he has finished it.
A Was writing B wrote C has written D had written
2.--You must be very hungry after 5 hours' hard work.
--Of course,___________.I ate up two bowls of noodles at supper.
A not at all B not a little C not a bit D not really
3.The poor man had to make a living by himself in________.
A the tenths B his teens C his tens D the teens