—Have you _________ the invitation of Lily’s birthday party?—Yes, but I won’t _________ it. I don’t have any time on that day.
On April 12, 1961,_____27—year—old Yuri Gagarin(尤里.加加林)became the first human to go into_____ space.
As young adults, it is our_____ to try our best to deal with each challenge in our education with the help of our teacher.
Please tell me________. I have some gifts for him.
—Please _______to return my book by Friday. I'll use it on Saturday. —No, problem. I'll finish reading it on Thursday.
—Hi, guys. Where are you heading now? —Home. We _________all our money, so we have to walk home now.