Grammar Practice Test

Which choice completes the text so that it conforms to the conventions of Standard English?

A laboratory manual describes a procedure for measuring enzyme activity in yeast. After mixing the solutions, the students place the test tubes in a warm water bath; _______ the temperature steady, they check the thermometer every two minutes.

Which choice completes the text so that it conforms to the conventions of Standard English?

In 2019, a museum acquired two notebooks written by the same explorer, and curators digitized both for researchers. Because the notebooks contain fragile sketches, the staff stores _______ in climate-controlled cases when they are not being scanned.