16. Generous public funding of basic science would ________ considerable benefits for the country‘s health， wealth and security.

A) lead to B) result from C) lie in D) settle down

17. In a time of social reform， people‘s state of mind tends to keep ________ with the rapid changes of society.

A) step B) progress C) pace D) touch

18. ________ the calculation is right， scientists can never be sure that they have included all variables and modeled them accurately.

A) Even if B) As far as C) If only D) So long as

19. Harry was ________ by a bee when he was collecting the honey.

A) stung B) stuck C) bitten D) scratched

20. The thief tried to open the locked door but ________.

A) in no way B) in vain C) without effect D) at a loss

 16-20 ACAAB