.Can you see the tree _____ we tied our boat last time?

watched the 2012 London Olympic Games agreedthat some Chinese athletes performed perfectly, such as Sun Yang and Ye Shiwen

you should go back to your plan,which is much more practical than the present one

These problems, ________, will seriously affect the growth of teenagers and even the nation’s future.

Bob was________to be studying at school,but to oursurprise,he was surfing the Internet. [ ]