China’s Chang’e 4 robotic probe entered lunar orbit on Wednesday, ________ a major step in its mission to make a soft landing on the moon’s far side.
A. marking B. to mark
C. having marked D. marked
They____with joy when they heard that their class won the first place in the relay race.
A. picked up B. split up C. took up D. sprang up
—It’s really great to have a computer to store my photos.
—Don’t count on it too much. It ________ break down and you’d better make a copy of them.
A. must B. can
C. should D. will
Bella, who is always cheerful, creates a friendly work atmosphere in her office every day,____ her colleagues find pleasant and relaxing.
A. where B. which C. when D. that
Being an experienced lecturer, Mr. Black____ his speech to suit a younger audience.
A. simplified B. addressed C. exchanged D. delivered
In many ways, the magic of AI is ________ it’s not something you can see or touch.
A. whether B. what
C. that D. why
