--- Is it all right if I keep this photo?--- _______.
— He is a very hard-working student.— .As far as I know, he often burns the midnight oil.
— Guess what! I came across an old friend at the party last night. — ____________! I’m sure you had a wonderful time.
______ around the cultural relics for almost an hour, we got together under a big tree for a short break.
---He ought to have been warned of the danger. ---_______, but he wouldn’t listen to me.
---You may find the key to the maths problem on page 107. ---Ah, it’s so simple. I wonder why I ________ of that.