Ihave _____ American friend. He is _______active boy.

When leaders of Chinese mainland( 大陆) and Taiwan met in Singapore for ______ first time since 1949. President Xi said， “Today will be remembered in history. “

Dad, why should I stop _______ computer games— For your study, my boy. You must stop_______ your homework now.

I ____ go to bed____ my mother came back home.

Bob was________to be studying at school,but to oursurprise,he was surfing the Internet. [ ]