40．A．pay                B．have              C．lend

A

39．A．beautiful             B．useful             C．careful

38．A．forget               B．remember        C．hear

37．A．help                B．make            C．use

36．A．slow               B．slower            C．faster

35．A．but                B．through           C．because

34．A．cheap              B．cheaper           C．expensive

33．A．few                B．little              C．a few

32．A．scientists            B．computers          C．students