---Look at the boy running on the playground. Is it David?---It ________ be him. I saw him go to the teachers’ office just now.
----What can they do? ----They can teach _________Chinese.
I’d like to join the English Club. I can’t speak English very _________.
----Are these gloves _____________? ----No, they’re not ____________.
Please be careful _________ your things from now on.
Bears live in cold countries, ______ they sometimes live in hot countries, too.