Mark has lived in China for many years, yet he still can't ________ himself to the Chinese customs.
A. observe B. adapt
C. lead D. devote
I was going to pay by cash when it suddenly occurred to me _________ I had left my purse at home.
A. whether B. what
C. that D. where
The Games are known as the friendly games because of their on kindness and mutual respect.
A. lacks B. focuses
C. challenges D. researches
This semester our school offers many optional courses for the students, _______ appeals to many students.
A. each of which B. all of whom
C. each of whom D. all of which
For many days I have been trying to what it is that makes Jack so annoyed.
A. carry out B. figure out
C. watch out D. stand out
some leaders and scientists have praised China’s achievement in space technology, others regard China’s progress as a threat.
A. Unless B. Once
C. Even though D. Now that
