Although you may meet some difficuIties,you should never .
Which of the following signs means ‘Don’t drop litter’?
—— It was great fun to be a volunteer, wasn't it?—— Yes. That's experience hard to forget.
—Would you please tell me________this DV?—Yes.It’s very easy.
—Would you like to tell me________?—Sure.Practice makes perfect.
The mountain was________steep________few people in our city reached the top.