Choose the appropriate option to fill the gap in the following sentences:
We couldn't find the official who was to act as our guide ...., he has left before we arrived
Choose the appropriate option to fill the gap in the following sentences:
No sooner had the examination ended .... the students started vacating the halls of residence
Choose the appropriate option to fill the gap in the following sentences:
Grace must be allergic .... smoke because any time she sits by someone who is smoking, she sneezes
