Pinetreesareusuallybelievedto_______coldweather.

Hetriedto_______relationswithhisformerwifebuthefailed.

If you have any problems during your study here,please do not _______ to call me for help

Theengineersinthislabspentseveralweeks_______theirplansforthenewbicycle.

Withoutapropereducation,peoplecould_______allkindsofcrimes.