last year , my sister tried to lose weight (减肥), but ______ putting weight back on.

The Eiffel Tower is made ________ metal. [ ]

I think watching __________ TV is bad for our eyes.—Me too.

Look at the boy running on the playground. Is it David? —It ______ be him. I saw him go to the teachers’ office just now.

My son want a pet rabbit for long, but I have no time to buy ______ for him.