Being a teacher always encouraging students to think for themselves, I won't tell them answers until they __________ on a math problem for more than an hour.
An official_________by some reporters on food problems in Shanghai yesterday.
We are glad to hear that the Greens_________to a new flat next week.
Now my father_________his bike to work every day instead of driving.
By the end of the last month, I_________all the CDs Of Justin Bieber.
— How long_________in Hong Kong? — For just the weekend. I’ll be back next Monday morning.