I’m calling, ______my company, to thank you again for your generous help

There is ____ “l” and ____ “u” in the word “luck”.

The retired man donated (捐赠)most ofhis savings to the school damaged by the earthquake inYushu,______ the students to return to their classrooms.[ ]

, however, provides an ideal location to_____ the technology at a low price.

We all wonder ____ the relationship between France and China is good again now? —Because the two countries have common national benefits.