Teachers have to constantly update their knowledge in order to maintain their professional __________.

Mum, can I go to the zoo with Linda —When your homework _______, you can.

She will never forget here stay there__________she found her son who had gone missing two yearsbefore.

Luckily, traditional Chinese medicine (TCM) is making a difference ______ the H1N1 flu[ ]

ou look up the time of the high-speed trains toShanghai —Yes, the early train is toleave at 5:30 a.m.