I don’t think ______ possible to master a foreign language without much memory work.
He is delighted to have ___ the examination.
The carpet where he _____was warm and comfortable, so he slept soundly.
Any student _____ will be disqualified from the exam.
The theory he sticks to ______ to be of no use in our studies.
The life he is now used _____ quite different from ours.