She was scared ___________ the yard because she was scared _________ by the big dog ___________ at the gate.

I don’t _________ the price, as long as the house is in good condition.

I recorded the professor’s speech on my cellphone _____ I could listen to it several times later

eptember 2008 , China’s key milestonein space travel_____when Zhai Zhigang conducted the first space walk.

My grandparents ______ a walk after dinner every day.