The mobile phone has influenced people’s life a lot since it .

He promised to pick me up at the school gate. However. he __ yet.

You’d better make a mark ______ you have any questions.

I don’t remember how many years ago _____ I was taken to Beijing for the first time.

Do you know if Kitty ______ shopping this afternoon?— I’m not sure. But if she , I will let you know.