This photo of mine was taken __________ stood the famous twin-tower before the 9.11 event.
I will never forget such a beautiful village __________ I spent my childhood there with my grandparents.
---Mom, can we move into our new house this weekend? ---No, it _________.
Mr Smith was so angry at all ________ Robert was doing _________ he walked out angrily.
By making friends with the native speakers, one can _________ a lot of their language.
The lecture that Mr Chen made this morning gave a strong ___________ on the students.