This is______difficult problem that few students can work it out.
——What’s wrong with the boy?——He is a(an) ________boy. He can’t run fast.
Would you like ________ to drink?
---There is a river ________ the two cities. ---________ the river there is a bridge.
There _______a “helping hands ” meeting _______ the afternoon ______May 1.
We have to learn __________ words this term..