______ watched the 2012 London Olympic Games agreed that some Chinese athletes performed perfectly, such as Sun Yang and Ye Shiwen.
If traffic moves at low speeds, the number of accidents is.
—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
---Do you mind if I keep pets in this building? --- _________.
---How bright the sun is! ---You’d better wear your dark glasses to_____ your eyes from it.
The two sisters are_______ different in character --- one talks a lot while the other is a girl of few words.