1.The doctor shares his phone number with the patients ________ they need medical assistance.           

A. if only                             B. as if                             C. even though                             D. in case

2.It was in the theatre          the man met his old friend          we saw this film.           

A. when, where                     B. that, where                     C. where, that                     D. when, that

3..—How long have you been studying at this school?

—I have been studying here ________.

A. since I was thirteen years old                          B. when I was thirteen
C. at the age of thirteen                                      D. after I was thirteen