Some of my workmates prefer to send to our QQ group ______ news they got

Scientists say it will be five or six years_____ it is possible to test this medicine on human patients.

If I _______ thhave broken down.

Everybody showed great respect to the old doctor, who devoted everything he had to __________ the poor conditions of the local hospital.

hy wasn’t John hired for the job — I don’t know, but he ______.