London is a most beautiful city in Britain, _____ the River Thames.

er to keep the balance of ecosystem, everypossible means _______to deal with the problems of the over-exploiting ofnatural resources

House owners keep their gardens in a neat and orderly state according to the regulations.

Until recently historians assumed that calendars ________ with the advent of agriculture.[ ]

What’s your hobby, Jack— I like playing football ______ listening to music.