. Tracy has gone abroad for further study. It ____ be her. The girl you saw yesterday is her sister.

Jack is a great talkerIt’s high time that he ________ something instead of just talking(2012·辽宁)

―Mum, can I stay inside and watch cartoons― ! I need you to help me in the garden.

Alice as well as her friends for the breakdown of the school computer network.

Could you do _____ for me, please—— Yes, with pleasure.