It is reported that a plane has ______ in the mountainous area near the borderline of that country.

I must tell you how _____ a letter from you.

The two companies decided to （ ） on a project concerning animal cloning.

It was while she was sleeping in her bedroom_____a thief broke into the house.

The purpose of the conference is to （ ） the friendship among the Asian countries.

Only when （ ） in the afternoon （ ） able to leave.

_____ dictionary is enough for me.

I decide to leave the company next month, where I _____ for exactly three years.

I have no objection （ ） your design for the new type of machine this time.

He learned how to use sign language to _____ with deaf customers.

Humble （ ） it may be, there is no place like home.

If you get into difficulties, don’t hesitate to （ ） help.