His sister left home in 1998, and _________ since then.
59. During the whole TV interview, the middle-school girl student never once looked me _____ .
58. It is said that a collection of paintings by David is _____ exhibition at the Museum.
57. I am sure you will excuse me _____ not telling you ahead of time.
56. In the college entrance examination, one of my students did very well _____ poor handwriting.
55. All the students envied him _____ having succeeded in the TOFEL test.