A warm thought suddenly came to me _______ I might substitute the hero to buy some flowers for his mother’s 60th birthday. 
| A．if | B．when | C．that | D．which |
I think Mrs. Stark could bebetween 50 and 60 years of age.
| A． | anywhere | B． | anybody | C． | anyhow | D． | anything |
Raymond's parents wanted him to havepossible education.
| A． | good | B． | better | C． | best | D． | the best |
______the nurses want a pay increase, they want reduced hours as well.
| A．Not do only | B．Do not only | C．Only not do | D．Not only do |
—Who’s that at the door?
—is the milkman.
| A．He | B．It | C．This | D．That |
Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.
| A．whether | B．why | C．when | D．how |