drop

It rained large drops.

Journey

I have a journey with my family.

Quantity

Quantities of food were on the table.

Experiment

The boy is doing the experiment.

Fresh

The shortage of fresh water is a big problem.

Salt

Mix up the salt with the pepper（胡椒）. 

on

He observed what was going on. 

Voice

 I know her by her voice.

Add

Add 8 and 7 to make 15.

chemical

Food is broken down by chemicals.

through

I had a browse through the books on the shelf. 

Pipe

The pipe burst.