—How about going hiking this weekend?--Sorry,I prefer ________to________.
The police warned the thief _______again.
I wonder_____ they will pass the exams or not.
The light______ by Edison is helpful for people.
—________do you practice your pronunciation?—I practice it _____ asking the teacher for help.
----Can you explain ______________________________, especially my writing?----Of course. It’s my pleasure.