Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ___we should deal with properly.

All we need is enough money __________ our work.

Talking with foreigners is a good way to _________/Impru:v/our English.

r reviewing is __good habit If you stick to it, you will make greatprogress in your study

Mistakes don’t just happen; they occur for a reason. Find out the reason, and then making the mistake becomes .