Thisriverissobigthatitisimpossibletobuilda_______underitwithoutmoderntechnology.

We won ’t allow any foreign country to _______ in our internal affairs.

What he said in the meeting _______ everybody present.

Professor Smith is also the _______ of the international program office. If you have any problem when you study here,you may go to him for help.

In order to increase our output, we need to import more production _______.