can’t afford meat, we shall have to____ with fish

How was the professor’s lecture?-Impressive. Thank you so much for giving me a lift during the rush hours. If not, I ________ the lecture today.[ ]

下列各句中，加横线的词古今意义基本相同的一项是（ ）

Chairman (主席) Xi asks us strict economy (厉行节约) in our daily life.

Encouraged by my science teacher, I set about my studies on developing my product, _____I hope I will succeed in applying for a patent（专利）.