Why ________ it get colder when we climb up a mountain? We are getting nearer to the sun!
. -- Do you think Allan came by taxi?-- No. If he had, I don't believe he ______ his bike here.
The road becomes so crowded during rush hours, ______ it becomes a very slow route.
-- The classroom looks like a mess!-- Yes, but who left the waste paper ______ around?
-- I think we'll give Bob a ring.-- We ______ . We have been out of touch with him for ages.
Honey, stay outside and ______ a few minutes; then we'll go to church together.