...... (Nature/laws) are fixed and shouldn't be questioned.

A doctor always remains at ...... (duty/call).

My children seem to be the ...... (fortune/favourites). They always get what they want.

The young teacher seems to be at his ...... (wit/end).

My friend Jack has managed to build up his own successful company in a ...... (year/time).

In two ...... (years/time) David will have sold his old house.

Henry will have moved to his new flat in five ...... (days/time).

In two ...... (hours/time) Andrew will have finished writing his SATs.

What's there in a ...... (day/work) for you?

The great job seems to be at a ...... (stone/throw).