Every Monday morning, students in our school would stand at attention, watching the national flag ______.
| A．raising | B．rising | C．being risen | D．being raised |
----- How did you know the surprising news?
----- I happened _______ the event then.
| A．to cover | B．to be covering | C．covering | D．to have covered |
If the wound ______ become infected, do not hesitate to call me.
| A．shall | B．must | C．should | D．would |
With two sons ______ in Afghanistan, John and Susie Mayes are working extra hard this year to make sure their grandchildren have a great Christmas.
| A．to serve | B．serving | C．having served | D．served |
In front of the city hall stands a statue of a monkey, _____ is said to bring good fortune to those who pat his head.
| A．that | B．it | C．which | D．one |
Be quick, _____ we’ll miss the beginning of the fireworks display in the park.
| A．so | B．or | C．because | D．though |