—Is there anything wrong, Bob? You look sad.—Oh, nothing much. In fact , I ____ of my friends back home.

One of them told me, “This is the first time I ________ to the capital to attend the flag-raising ceremony.”

The problem just________to be discussed at the class meeting tomorrow.

While every possible means __________ to prevent the river pollution, the river in my hometown has still not been restored to its past beauty. 

 A new company _____ here at present. They hope to finish it next month.