Some insects _____ the colour of their surroundings to protect themselves.

I apologize to you for my rudeness yesterday, Mary.— Never mind, and I think ________of it. [ ]

When you phoned me, I was having a meeting, otherwise I _____your call.[ ]

The little girl ________ to be a good singer if she gets good training in a music school.

I appreciate ________ if you accompany me to the Shanghai World Expo.[ ]