Mr. Smith couldn’t open the door because his naughty boy ______ it from the inside.

 My uncle from Hongkong has changed so much that I could hardly ________ him at the airport. 

 By the time Jack returned home from England，his son ________ from college.(2011·辽宁)

 I had hoped to get to the meeting, but I found at the last minute that I couldn’t ________ it. 

Last month, the Japanese government expressed their thanks for the aid they ___ from China.