Ifyouhaveanyproblemsduringyourstudyhere,pleasedonot_______tocallmeforhelp
A、hesitateJohn _______ to be a polite man. But in fact he is veryrude.
Afterworkingfortwentyhourswithoutanyrest,thedoctorswere_______.
This river forms a natural _______ between China and Korea.
We can not trust him any more because he often________ his duty.
Heworksinouruniversityasavisiting_______,notasaformalfacultymember.
