-- _______ the soldiers are very tried, __ they keep on working.
--They are great. We must learn from them.

Bill won’t make any progress __ he studies harder than before.

Leo is my good friend. He likes tennis         ping-pong.

Finally, tired          happy, we took the subway back home.

—Don’t play with the knife, ______ you’ll cut your hand. —Sorry, I ______ .

________ Tom ________ Mary speaks good Chinese, so they can communicate with these Chinese students very well.

We won’t start the meeting         our teacher arrives.

He was riding to school         it began to rain.

Be quick, ＿＿＿we’ll be late for school.
A.   and      B.    or    C.   so

－How about having a picnic with me?
－I’d love to, ______ I’m afraid I have no time.
A. so    B. and     C. but