Vitamin D gets produced when animals are exposed to direct sunlight, for＿reason, it
is always advisable to give them chances to spend time in the sun.
A. whose B. that
C. which D. its
In the middle of February, the weather＿＿favorable for work, the workers began to repair and secure the dam of the river.
A. was B. being
C. would be D. to be
一Did you go to Taylor Swift's concert last night?
一I would rather I＿＿．But I was preparing a report for my boss.
A. did B. had
C. would D. might
The local guide told the explorers that ropes and knives were＿＿wanted to go into the inner part of the mountain must take along.
A. that whoever B. what who
C. what whoever D. that who
In many cities of China, if an ambulance is＿＿in a traffic jam, police will respond to the emergency.
A. held up B. held back
C. held down D. held out
一I think I saw Mr. Smith at yesterday's party.
一He＿＿there. He is now on a business trip in Greece. And he left the day before
yesterday.
A. mustn't have been B．couldn't have been
C. might not be D. should not be
