One useful anti-cancer drug can effectively erase the whorls and other characteristic marks that give people their distinctive fingerprints. Losing __(1)__ could become troublesome. A case released online in a letter by Annals of Oncology indicates how big a __(2)__ of losing fingerprints is.

Eng-Huat Tan, a Singapore-based medical doctor describes a 62-year old man who has used capecitabine to __(3)__ his nasopharyngeal cancer. After three years on the __(4)__, the patient decided to visit U.S. relatives last December. But he was stopped by U.S. customs officials __(5)__ 4 hours after entering the country when those officials couldn't get fingerprints from the man. There were no distinctive swirly __(6)__ appearing from his index finger.

U.S. customs has been fingerprinting incoming foreign visitors for years, Tan says. Their index fingers are __(7)__ and screened against digital files of the fingerprints of bad guys — terrorists and potential criminals that our federal guardians have been tasked with keeping out of the country. Unfortunately, for the Singaporean traveler, one potential __(8)__ effect of his drug treatment is a smoothing of the tissue on the finger pads. __(9)__, no fingerprints.

"It is uncertain when fingerprint loss will __(10)__ to take place in patients who are taking capecitabine," Tan points out. So he cautions any physicians who __(11)__ the drug to provide their patients with a doctor's note pointing out that their medicine may cause fingerprints to disappear.

Eventually, the Singapore traveler made it into the United States. I guess the name on his passport didn't raise any red flags. But he's also now got the explanatory doctor's note — and won't leave home __(12)__ it.

By the way, maybe the Food and Drug Administration, __(13)__ approved use of the drug 11 years ago, should consider __(14)__ its list of side effects associated with this medicine. The current list does note that patients may experience vomiting, stomach pain and some other side effects. But no where __(15)__ it mention the potential for loss of fingerprints.

1. A) he
B) them
C) her
D) him
2. A) theme
B) topic
C) creation
D) problem
3. A) treat
B) cut
C) find
D) smooth
4. A) recovery
B) diet
C) drug
D) diagnosis
5. A) in
B) at
C) for
D) on
6. A) digits
B) marks
C) images
D) pictures
7. A) printed
B) located
C) cured
D) placed
8. A) normal
B) good
C) main
D) side
9. A) However
B) Hence
C) Moreover
D) Furthermore
10. A) begin
B) like
C) decide
D) have
11. A) prevent
B) preserve
C) presume
D) prescribe
12. A) off
B) on
C) without
D) with
13. A) who
B) where
C) when
D) which
14. A) updating
B) using
C) printing
D) cancelling
15. A) must
B) does
C) may
D) should