He found_ ________very difficult ________the math problem.
You are Hugo’s best friend. Can you ask him______ late for school?A.not be B. not to be C. don’t
I have _____ a member of the music club for many years.A. been B. became C. joined
Kobe Bryan is one of _______in the USA.A. popular basketball playerB. the most popular basketball playerC. the most popular basketball players
_____ you _____the singing competition The voice of China last year?A. Have; entered. B. Did; enter. C. Did; entered
South Africa (南非) is a country.