Sometimesitisverydifficultto_______someoftheEnglishwords.Eventhenativespeakercannothelp.

Studentswith_______problemsmayapplyforstudentloans.

Inordertoincreaseouroutput,weneedtoimportmoreproduction_______.

Theengineersinthislabspentseveralweeks_______theirplansforthenewbicycle.

He_______tostudyharderinthefuturesothathecouldhavemoreopportunitiestofindabetterjob.