Lots of the scientists in our country are working hard to ____the planet Mars .

Helen was fully occupied_____business matters, so we didn’t want to brother her.

--What can I do for you,sir? ----I”d like to see the manager ________of sales department.

We are interested in the weather because it＿＿＿＿　us so directly---what we eat, what we do, and even how we feel.

You were_____ to help us, but you all escaped.