The box is ______ heavy for me ______ carry.[ ]

Shen Xue and Zhao Hongbo won the gold medal for China so we’re proud _____ them. [ ]

Mum is ill in bed now. I must ____________ her.

It’s important ______ us ______ some good books.[ ]

Tim is _________ one-year-old boy. He can say a few words.