【推荐3】_______about her ideal university, Jenny said she had no idea.

A．Ask

B．When asking

C．Asking

D．When asked

【推荐1】While scientists are finding ways to make batteries smaller, problems can ________ when they are much larger and heavier than the devices themselves.

A．rise

B．arise

C．raise

D．arouse

【推荐2】Sadly, the population of monarch butterflies has ________ dramatically over the recent years.

A．exploded

B．crashed

C．risen

D．spread

【推荐1】When a bigger problem ______ at school, I tend to sleep on it and come back to it in the morning.

A．comes across

B．comes to

C．comes up

D．comes over