Can you tell me _______to talk to and ________to gethelp when we have problems?

In that school, English is compulsory for all students, but French and Russian are _____. [ ]

Life has become so easy for children today that they the spirit to work hard.

_____ the evening of May 31, the 2012 FIFA WorldCup started in Thailand.

He made _____ experiments to prove his theory, and the number _____ added up to 600.