She remains optimistic (乐观的) in spite of so much hardship she has _____.

aged by my science teacher, I set about mystudies on developing my product, _____I hope I will succeed in applying for apatent.

Children _______ sit in the front seat of a car. It’s too dangerous.

What’s your plan for this winter vacation?– I’ll take an express train to Dalian for my holiday ______ school ends

We________on this project for four hoursLet’s have a rest