My grandma started using Weibo at the age of 70. She always says it’s never ____ old to start doing things.
My parents________for me to have dinner when I got back home yesterday evening.
Most people are________building a paper factory near here.They are worried the river will get polluted.
Yesterday evening I was playing the piano________the doorbell rang. A.when B.before C.while
Tony________TV when his mother came in.
I saw him in the library yesterday.He________a book at that moment.