Directions: Read the passage given below carefully and then answer the following questions. 

China has given conditional approval for a single dose Covid-19 vaccine, touted to be a _____(1)_____  to Johnson & Johnson’s one-jab shot cleared by the US drug regulator on Sunday.

China's first Ad5-nCoV Covid-19 vaccine was ____(2)_____  out on Friday, the state-run Global Times reported on Sunday.

Phase-I clinical trials of the vaccine started on March 16, last year, making it the world's first Covid-19 vaccine ____(3)_____  that entered clinical trials, it said.

It is the only single-dose Covid-19 vaccine that has been given conditional approval to be rolled out in China, the report quoted last Friday’s story by the state broadcaster China Central Television (CCTV).

People can get desirable ____(4)____  effect after 14 days of inoculation.

The protective effect can last at least six months after a single-dose inoculation and it can increase immune response by 10 to 20 times if the second ____(5)____  is taken half a year after the first one, the report said.