Allow children the space to voice their opinions, ________ they are different from your own．

until

even if

unless

as though

He tried his best to solve the problem, ________ difficult it was．

however

no matter

whatever

although

My suggestion is that we ________ a few more assistants to help the engineer working busily on the machine．

sends

sending

to send

send

________ about wild plants that they decided to make a trip to Madagascar for further research．

So curious the couple was

So curious were the couple

How curious the couple were

The couple was such curious

________ that they may eventually reduce the amount of labor needed on construction sites by 90 percent．

Such construction robots are clever

So clever the construction robots are

So clever are the construction robots

Such clever construction robots are

Although she did not know Boston well, she made her way ________ to the Horse Circle Building．

easy enough

enough easy

easily enough

enough easily

________ the precise qualities of the hero in literary works may vary over time, the basic exemplary function of the hero seems to remain constant．

Whatever

Even though

In spite of

Regardless

________ it was very late, ________ he was still doing some experiments in the lab．

Although; but

Although; yet

Even though; but

Though; but

What ________ it is to travel around the world by sea!

a fun

pleasure

fun and a pleasure

a fun and a pleasure

When the police arrived, the man was requested ________ the safe place as quickly as possible．

to come off

to come for

come out

come up