—Why did you arrive late? —The fog _____ our air flight for about half an hour.
—The hall___ for international conferences is of great importance —I see, and we are sure to complete it on time
Since Tom ___ downloaded a virus into his computer, he can not open the file now.
Many Chinese universities provide scholarships for students_____ financial aid.
Jack failed to seek a job for his poor education, though he was ____to get one to support his family.
Having seen the X-ray, the doctor decided to ________ the patient.