I had a really hard time _____studying science this term.
—What do you think of the movie If you are the one II(非诚勿扰2)?—It’s wonderful. I ___________ it twice.
—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.