Do you know how to ________ the problems in life—Well，I didn’t use to know，but I do now.

I ________ his invitation because I had to look after my sister.

Follow these tips, and your time spent doing research on the Internet ______ much more worthwhile.

Sorry, I’m late. —It’s OK. However, you________come to the company today, for it is Saturday. [ ]

t my glasses, I couldn’t whetherthat figure on the blackboard was a three or an eight