29. The field research will take Joan and Paul about five months; it will be a long time ______ we meet them again.
---It is so crowded. Where is Jack? ---He is very tall. We can easily _____ him in the crowd.
They forced ____ little children to work all day for so little money____ everyone couldn’t bear that.
My former English teacher, who ____ in our school for over 20 years, now lives in his hometown in Yangzhou.
______ he met with the difficulty did he realize the importance of our help.
. When he came back, he found the bag he had _____ over the seat was gone.