We can’t wait. We have to_________ thedirection and the distance before we take action.

Last Sunday was Mr. Wang’s birthday. Heinvited a lot of people ________.

No one knows exactly when ourancestors started talking, but new evidence suggests that____ might havehappened a long time ago.

Which skirt do you prefer, Lucy? — _______ I’m concerned, the purple one is better

Hi, Lucy. Your skirt is very nice.—____