The ____ you study for these exams, the ____ you will do.

• hard - better

• harder - more successfully

• much - better

• most – best

_____ I known you were waiting outside, I would have invited you to come in.

• If

• Should

• Although

• Had

________ we to give up the fight now, it would mean the end of democracy in our country.

• If

• While

• Were

• Because

_________ your child become anxious or nervous about any activity, it is a good idea to inform the team-leader.

• If

• While

• Although

• Should

They may do whatever they like _________ that it is within the law.

• provided

• after

• so

• thereafter

_________ there was no conclusive evidence, most people thought he was guilty.

• Since

• Once

• Because

• While

________ you have finished, let me know.

• Since

• Once

• Because

• While

Plastic bags can _________ drains.

• cause

• clot

• clog

• decompose

Producing plastic bags ________ millions of gallons of petroleum.

• require

• requires

• use

• spends

This plant is found to be _______ high in lutein that is becoming more and more precious.

• very

• such

• so

• once