—I have worked hard at math, but it seems that I haven’t made any progress. —Keep on _____ at it, and you will be successful. A. work B. working C. to work
I like English novels_______Chinese stories.
.Lingling got up early_______she could catch the early bus.
He spent a lot of time______English.
----Is your brother badly ill? ----No,_____.He’s just caught a cold.
we’ll climb Qianling Hills if it_____next Sunday.