—Did you hear that Tonna took social management as her major?—Yes,but she shouldn’t have,you see.This kind of subject ________one’s communication ability,and that’s what she is most weak at.

Sometimes, while living in a foreign country, one ________special dish from home.

Jane tried to keep up a calm appearance，but her trembling voice ______.

I can ____the house being untidy, but I hate it if it’s not clean.

The Mekong River, which________ several countries in Southeast Asia, ______to be playing a significant role in the region.