I think Lily will make greater progress in her painting ____ she studies hard enough.

After reading the report, I found ____ important to do something to protect the birds in the wild.

(2013·黑龙江双鸭一中月考)It was several years ________ I realized ________ David had lied to me

od there for seemeda long time, wondering hewas going in the direction

You seem to be familiar with this city．—Iherefor three years．It’s great to be back．