21. He__ and asked me if I knew the time. .

A. came up with      B. Came about             C. Came up            D. Came across

22. When I give up work I shall take a long __ over sea.

A. trip                 B. Travel                   C. journey              D. voyage

23. As is known to all language learners, the newly learnt words will soon be forgotten unless__used in everyday communication.

A. gradually           B. Accurately               C. familiarly         D. frequently