----She looks tired. ----Yes, she _________ for about twelve hours a day.
All my classes finish ____________ 4:00 p.m. A.in B.on C.at
Every day I can play computer games ____________ one hour. A.on B.for C.at
He likes science ____________it’s very interesting. A.and B.so C.because
We have math ____________ Monday. A.in B.on C.at
He usually has a shower ____________ he goes to bed. A.before B.after C.when