Form their ________ on the top of the TV Tower, visitors can have a better view of the city.
I often read China Daily, ____of great help to my English study.
His father, who is said to be teaching in Australia, ____ in Nanjing University for more than 10 years.
—— Oh, it’s raining hard outside. Mum, do you think the milkman will come? —— Of course. He will come on time _____it rains.
Though the book is a little expensive, it is _____.
It is required that students _____mobile phones at school, so seldom _____them using one.