Trees can stop the sand _____ towards the rich farmland in the south.
My friend Anna____ text messages to me on the mobile phone. But now she ____e-mails on QQ.
---I saw Mr. Smith in the office at ten yesterday morning.---That’s impossible. He _______ an English party with us then.
---What are you doing, Jack?---I’m looking for some information about famous people ______ can help memake a poster.
So far, three quarters of the work_____ by others, it’s your turn to do the rest of it.
--Do you have ________to tell me ?--No. That’s only________ I want to say.