1. だろう。
She will cope with difficult problems.
2. 。
She was depressed by all her problems.
3. 、。
They are helping him to solve it, but, all the same, it is a hard problem.
4. 。
He likes to work out the difficult questions.
5. だろう。
He'll cope with difficult problems.
6. 。
He is faced with a difficult problem.
7. 。
I puzzled over the difficult math problem.
8. 。
I'm at my wit's end with this difficult problem.
9. 。
The separation of gold from sand is problematic.
10. 。
You are too clever not to solve the hard problem.
11. 、。
The smart boy could solve all the difficult problems with great ease.
12. 。
This is how I solved the difficult problem.
13. 。
This problem bristles with difficulties both psychological and economical.
14. 。
This is how he solved the difficult problem.
15. 。
He solved the difficult problem.
16. 。
It's a hard problem.
17. 。
It's not a difficult problem.
18. 。
It's certainly a difficult problem.
Lingaku