We are _______ at the rapid progress Mark has made in this semester.

Thisboywas_______forwhathehaddoneintheclass.

Professor Smith is also the _______ of the international program office. If you have any problem when you study here,you may go to him for help.

After working for twenty hours without any rest, the doctors were _______.

Thismorningintheclass,ourteacherlosthis______atlastbecausehecouldnotstandanymore.