The vegetation layers in Cat Ba Archipelago form spectacular and scenic landscapes and make the site become ______ of all Vietnam's typical ecosystems

The coffee was very strong, but it couldn't keep us awake.

The coffee was so strong that we couldn't sleep.

The coffee was not strong enough to keep us awake.

We was kept awake because the coffee was strong.

As soon as he feels better, he'll try to stop smoking.

When he stops smoking, he'll begin to feel better.

He feels so much better since he stopped smoking.

Though he feels better, he still smokes.

Jasmine's doctor insisted that she should rest for a few days.

The doctor suggested that Jasmine should take a short rest.

The doctor strongly advised Jasmine to take a few days rest.

It is the doctor's recommendation that Jasmine rested shortly.

I couldn't study last night because I was very tired

I studied last night, so I was very tired.

I tried to study last night but I felt bored.

I didn't study last night because I felt very bored.

I used to go by train.                                      

I was used to going by train.

I never find it boring to go by train.                  

I never thought of going by train.

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