It’s___(reasonable)to expect people to work more than 60 hours a week.

Itisessentialthatyou__________anydocumentcarefullybeforesigningit.

If you have difficulty locating a particular book ，please ask our librarians for___(assist).

That is ______ we differ.

Ithoughtherrequestforfinancialaidwas___(reason),butsomehowitwasrefused.