(the student went for the pencil.) el estudiante fue el lápiz. (a house costs at least thirty thousand dollars.) una casa cuesta lo menos treinta mil dólares. (did you send me the money by mail? ) ¿me enviaste el dinero correo? (the stone house was built by the incas.) la casa de piedra fue construida los incas. (fidel spoke for four hours.) fidel habló cuatro horas. (we go to the beach for the purpose of swimming.) vamos a la playa nadar. (i'll give you $50 for your pants.) te daré $50 tus pantalones. (andrés took the plane for barcelona.) andrés tomó el avión barcelona. (that book is for manuel.) ese libro es manuel. (the bus goes 100 kilometers per hour.) el autobús va a 100 kilómetros hora.

In this exercise, you have to fill-in the blanks using the correct preposition, the options are por and para

Explanation:

The student went for the pencil - El estudiante fué por el lápiz

A house costs at least thirty thousand dollars - Una casa cuesta por lo menos treinta mil dólares

Did you send me the money by mail? - ¿Me enviaste el dinero por correo?

The stone house was built by the Incas - La casa de piedra fue construida por los Incas

Fidel spoke for four hours - Fidel habló por cuatro horas

We go to the beach for the purpose of swimming - Vamos a la playa para nadar

I'll give you $50 for your pants - Te daré $50 por tus pantalones

Andrés took the plane for Barcelona - Andrés tomó el avión para Barcelona

That book is for Manuel - Ese libro es para manuel

The bus goes 100 kilometers per hour - El autobús va a 100 kilómetros por hora

In these cases, por and para replace:

for in several instances

by in several instances

at (in at least)

for the purpose of

per

the right answer is c. tiempos

el partido de fútbol tiene dos tiempos

in english, this translates:

a football match has two halves

these halves cosists of 45 minutes each.   each half runs continuously. on the other hand, there is usually a 15-minute half-time break between halves.