1. Good books ____ again and again.
A. should be readed B. should be read
C. must read D. ought to read
2. The children ____ by the nurse.
A. were looked B. looked after
C. were looked after D. looked
3. He ___ some pieces of advice, but he ____ to them.
A. gave, didn't listen B. was given, wasn't listened
C. give, wasn't listened D. was given, didn't listen
4. When____ the accident _____ ?
A. was, happen B. did, happen
C. is, happen D. was, happened