The students found _______ easy to work out this maths problem.
—I went to see you yesterday evening.But you weren’t in.Where were you then?—I’m sorry.I________a walk by the lake with my classmates.
While we________about Mr.Wang in the classroom,he came in.
I was doing my homework________my father was reading newspapers.A.howB.whileC.if
—I was at the cinema at 9 o’clock last night.What about you?—I________at home.
—Do you know________?—This afternoon.