The technological advances of the twentieth century have been brought about an alarming reduction of our natural resources

My family consider acomputer, which is considered agreat help in our work and study.

His sister left home in 1998, and _____since. [ ]

It is the third time that Susan ______ late to work and it’s high time that she ________the truth

I’d like to buy a skirt like this.—OK. We can buy a _____ one than this, but as nice as this.