1. the two girls had been talking in ________ low voice all ________ time during the meeting, which upset the manager. a. a; / b. /; / c. /; the d. a; the 2. the child was told to ________ for being rude to his uncle. a. excuse b. apologize c. pardon d. thank 3. scientists have to work hard to keep ________ with modern discoveries and developments. a. company b. track c. pace d. touch
