—We are worried about Tom. Why hasn’t he come back?—Don’t worry. He ______ in a traffic jam.
People still lack knowledge about what can be recycled and what cannot, especially when it comes to __________ kitchen garbage. 【选项 】
The first decade in the 21st century __________ the rapid rise of China as a world economic power.
__________ the city centre, we saw a stone statue of about 10 metres in height.
Tom was about to close the window __________ his attention was caught by a bird.
After the earthquake, the first thing the local government did was to provide __________ for the homeless families.