91.   But testing is costly.

92.   But testing is spotty and experts fear many more are infected.

93.   China has said that its testing is necessary to ensure the safety of its nuclear devices and to catch up technologically with Britain and the United States.

94.   China has said its testing is necessary to ensure the safety of its nuclear devices and to catch up technologically with Britain and the United States.

95.   Discussion with other nations with nuclear weapons will focus on whether testing is necessary and if so, what kind of tests should be conducted, Perry said.

96.   Even supporters of genetic engineering say more testing is necessary, especially when food is involved.

97.   He said testing people anonymously was good because it gave very objective data compared with the current method of testing voluntary subjects.

98.   In a government statement Wednesday, India said its testing was now complete, and it was prepared to consider a testing ban.

99.   Its testing is now complete and it is prepared to consider a ban on such tests, the government said.

100.   More testing is necessary to see if this approach will be useful.