62._________A. foundB. workedC. turnedD. set

He won the scholarship. He ______ hard these terms.A．should have workedB．must have workedC

He felt very tired because he ______ 18 hours without a rest.A．had workedB．workedC．was wor

Joan said she ______ that there was something wrong with the machine.A．had foundB．has foun

Nothing but some magazines______in her handbag.A．were foundB．was foundC．has foundD．had fou

The term " usher in" in Paragraph 4 can be replaced by______.A．foundB．createC．leadD．introd

______harder, he would have got through the exams.A．Had he workedB．He had workedC．Should h