Do be careful with those fireworks; the slightest spark could _____ them _____ .
| A．set; out | B．set; off | C．set; about | D．set; up |
We have various summer camps for your holidays. You can choose ____ based on your own interests.
| A．either | B．each | C．one | D．it |
The two girls are so alike that strangers find ________ difficult to tell one from the other.
| A．it | B．them | C．her | D．that |
（2012陕西卷）No matter where he is, he makes _____a rule to go for a walk before breakfast.
A. him B this C. that D. it
Sophia waited for a reply, but ____ came.
| A．either | B．another | C．neither | D．none |
Studying Wendy's menu, I found that many of the items are similar to______ of McDonald's.
| A．those | B．ones | C．any | D．all |