The shopping mall is making every effort to ________ new customers in order to sell more foods.

In China, those who want to enter universities have to _______ the entrance exams in June.

The research on the new flu virus vaccine ischallenging and demanding. Who do you think can do the job —_______ my students have a try

_______ do you save your homework— I save my homework in a new document.

led to tell me that you are in hospital, otherwise I ______ nothing about it.