My father is hard ______ me.

Our teacher is always busy preparing lessons until 11 o’clock at night, _______we students have gone to sleep.

There are ________ studentswaiting in the hall, ________

265. Solids can usually be turned intoliquids and liquids into gases if we _____ their temperatures high enough.

It was reporfted that eight policemen weresent to the forest ____ the missing girl[ ]