Learning requires patience．The same is true of making friends．

He was the only candidate; therefore, he was elected．

We do not have enough money．Therefore we cannot afford to buy the new car．

He was busy, therefore he could not come．

He was very tired and therefore he fell sound asleep．

How many people were present at the meeting?

He had to present a smiling face though heavy-hearted．

I presented an advice letter to my headmaster．

They presented him with a bunch of flowers．

He lagged far behind his classmates because he had relaxed his efforts．