—I find the more we study, the more difficulty we have _______ out Maths problems.—Oh, I agree with you. Maths is more and more difficult.
Mr. Wang felt________ after his children moved out.
I was late for school because my alarm didn’t_________.
.—_________ —I have a headache.’
Liu Ying is good at singing. She sings ________ the famous singer.
—Could you please help me take out the rubbish? —__________