My aunt has ____________ Beijing. I’m going to see her this weekend.

_______ difficult the task may be, we must finish it on time, because we can’t meet such a precious opportunity _______ we have expected.

You can always _____ a dictionary if you meet new words during your English study.

The doctor said that maybe his disease is __________ the water he drinks.

If you try to do many things______, you’ll become tired out.