_______ in the regulations that you shouldn’t tell other people the password of your e-mail account.
A. As is required B. It is required
C. It requires D. What is required
Walking out of the theatre，the famous singer found himself ________by his fans．
A. surrounding B. surround
C. surrounded D. being surrounded
---Why are you so disappointed？
---I went there hurriedly and waited there for 3 hours，______ the tickets have been sold out．
A. only to be told B. only to tell
C. telling D. being told
We can hardly believe such a young boy_______ travel around the world all by himself.
A. may B. need
C. should D. must
President Xi Jinping demanded the environmental problems _______paid special attention to.
A. referred to be B. referred to being
C. refer to being D. refer to be
--- Haven’t seen you for ages! Where have you been ?
--- I went to Ningxia and _______ there for one year, teaching as a volunteer.
A. have stayed B. stayed
C. had stayed D. am staying
