—Where ________ I meet you tomorrow morning?—I haven't decided the place.But I'll call you soon. 

--It is really fun to hike and I often go hiking in the forest.--But hiking alone in the forest ______ be very dangerous.

—We are worried about Tom. Why hasn’t he come back?—Don’t worry. He ______ in a traffic jam.

I’m impressed with his determination. When he had a problem to solve, he  _____ work at it until he found an answer.

—Are you in a hurry?—No, I’ve got plenty of time. I _______ wait.