He sat at the desk, __________ a novel.

—             us a definite answer can’t solve the problem.—I agree with you. Someone must have a talk with him.

After starting work, Cao spent his evenings _____ in his books and was eventually admitted to a secondary technical school.

I don’t allow __ in my drawing-room. I don’t allow my son __ at all.

Which do you enjoy___your summer holiday,taking a part-time job or staying at home?