16. The computer program is a puzzle to me. The more I think of it, the more questions I think of _____.
— What were you doing when I phoned you last night?— I ______ my homework and was starting to surf the Internet.
It may be fairly cheap to buy, but you’ve got to ______ the money you’ll spend on repairs.
The winter of 1990 was extremely bad. ______, most people say it was the worst winter of their lives.
Please don’t phone him between 1 and 3 p.m. tomorrow. He ______ a lecture then.
The Ministry of Education is ______ that primary and middle school students perform one hour of physical exercise a day.