He is a new comer. There is no one _________, so let’s go and help him, shall we?

About _______of the engineers in my company seem to be in their _________．

Attention！_______ in the form right now，making sure that every detail supplied is accurate.

Mr. Smith, together with his two sons,_____Shanghai for about five months.

_________that developed countries want to limit the development of the developing countries in the climate conference in Copenhagen.