The verb "laboured" is followed by the preposition "over," which means to work hard at something.

It seemed that he was going to lash out ____ her but he controlled himself.
(a) at (b) in (c) on (d) to

The verb "integrate" is followed by the preposition "into," meaning to combine with something else to form a complete whole.

Nothing must be allowed to interfere ____ our search for the truth.
(a) with (b) into (c) from (d) upon

To "enquire after" someone means to ask about their health or well-being.

An attractive feature of the course was the way the practical work had been integrated ____ the theoretical aspects.
(a) with (b) in (c) into (d) to

To "implant in" someone means to establish an idea or attitude in their mind.

As there was no train until the late evening he had to imposed himself ____ his hosts for longer than he had intended.
(a) on (b) in (c) with (d) from

The verb "impelled" means to drive, force, or urge someone to do something. The correct preposition is "to."

The revolutionary leaders implanted ____ the peasants the determination to take and own the land on which they worked.
(a) on (b) down (c) in (d) at