用many ,much,few或little的适当形式填空
he didn't have___vacations last year.this year he has even____.
there are____robots now.but i think there will be a lot ____in the future.
young workers usually make___money than old ones.And they have to spend___time on the new work.
the scientists have tried___times,but they still don't have any information about the UFO
If i spend ___time on study.i am sure i will get better grades.