In summer milk will quickly go bad_____ it is put into a fridge.
—When shall we go to the park, this morning or this afternoon?—________time is OK. I’m free the whole day.
I find _______difficult to finish the work on time. We only have three hours left.
If you want to know the meaning of the word______, you’d better look it up in the dictionary.
--______are the Olympic Games held?--Every four years.
She is a ________ girl. Everyone in our class likes her.