____ he was very tired, he didn’t stop to have a rest.

Hiking is ____ great fun .You will get close to ____ nature and take exercise at the same time.

I’ve always treasured the watch______ to me on myeighteenth birthday.

Is everything settled? —Not yet. _____ I approached the problem, I couldn’t find a solution.

32．How_________I help them to understand when they won’t listen to me?