He doesn’t think the question of ________ they are boys or girls is important.[ ]

The open university was started in order to help those who _____ having a university education when they were young.

—Can you pick me up after work? My car ______. —With pleasure. [ ]

The Huanghe River is the second ___river in China.

While typing, Helen has a habit of stopping _____ to give her long and flowing hair a smooth