21．He opened his mouth ______ he would say something.
A．even if B．even though C．as if D．if
22．It was weather that we decided to go for a picnic that day.
A．so fine B．such fine C．so fine a D．such a fine
23．All the doctors in the hospital insisted that he ______ badly wounded and that he _____ at once.
A．should be; be operated on B．were; must be operated on
C．be; was operated on D．was; be operated on
