The countryside is very peaceful ________ the air is so fresh.

He didn't go to school yesterday; ______, he had to ask his friends what they learned then.

Ba missed the Math test yesterday. ________, he will have to do it next week.

____ lion dancing is very popular in Viet Nam, my friend Andy does not enjoy it

Dioxins are dangerous chemicals________ they can cause cancer and birth defects.

He is very stubborn, so it will be difficult to _______ him to go.

My shoes are dirty. I'd better take them ________before I come in.

Children are _______ to overcome problems.

Old newspapers can be used to make newspapers, ________ you can collect them and bring them to the recycling center.

My sister is very tired; ________, she still has to cook dinner for the family.

Scientists are looking for an ________ way to reduce energy consumption.

Daisy is very nice; ________, all her friends love her very much.

We decided not to go out for meal _________ we were too tired.

We can ________ easily in the daylight.

If you want to save money, you should ________he amount of water your family uses.

The children ate too much sweet ________ they get toothache easily.

A new conditioner will be ________ this morning.

Hoa missed the bus this morning, ________ she went to school late.

My color TV, _______ I bought 10 years ago, still gives beautiful pictures.

They are completely short of water now. A number of people have died because of this ___

What are you looking ________? My picture book. I've lost it.