A. is B. are C. was D. were
A. has tried B. have tried C. is trying D. are trying
A. was keeping B. keep C. keeps D. were keeping
A. is washing away B. is being washed away C. are washing away D. are being washed away
A. has been offered B. have been offered C. is being offered D. are being offered
A. knows B. know C. have known D. am to know