单项选择题
After a ship leaves a foreign port, you should （）that country’s national flag.
A.hoist B.lower C.hoisted D.lowered
单项选择题 When a ship arrives at a foreign port, you should hoist （）national flag.
单项选择题 We should （）the national flag when the sun sets.
单项选择题 When you hoist national flag, you should hoist it in （）place.
