1.There are certain ________ when you must interrupt people who are in the middle of doing something.
A) conditions
B) situations
C) occasions
D) environments
2.The time is not far away ________ modern communications will become widespread in China’s vast countryside.
A) when
B) as
C) until
D) before
3.You should hire a more ________ manager than the one you currently have.
A) sufficient
B) effective
C) respective
D) efficient
4.Pupils who pass the test will be ________ to the next grade.
A) promoted
B) proceeded
C) progressed
D) proposed

1. A 2. B 3. D 4. C

能给详解吗？谢谢！