Parentsalways ask their children ___ all kinds of difficulties bravely.

3. They will fly to Washington, ___________ they plan to stay for two or three days.

The project, intended to ___ the economic development of the west of China, has brought in benefits to the local people.

What made her so upset? — __________

Sir, would you mind my sitting next to you—__________. My father will sit here in a minute.