The increase of the number of the students makes the limited computers not ______ to each student.
--- You promised to call me last night. --- I called, but I just couldn’t _______.
Even if you are an experienced teacher , you sometimes _____ make some mistakes.
-----An ant has two stomachs --- one for itself, one for others. -----Really? Quite interesting. I ____ anything about it.
We must work hard and make _______ continuous progress so that we can make _______great contribution to our country in the future.
Not knowing what version of iPad to choose, _____.