How long have you been _______ China, Maria—___________ 2007. I fall in love with China now.

They ____ repairing the wall. The _____ wassmooth（顺利）.

The officials of the National Ministry of InformationIndustry advise people to limit the personal information theymake about themselves online

The professor________his thoughts before giving his lecture，so that he could make himself understood well.[ ]

They made their way in the shop_______shoppers.