Look out! Keep away from the house, _____ the roof is under repair．

We have some boxes. But we need________ .

What are the man ______ in the office ______ the boss?

Mike couldn’t solve the problem and I couldn’t, ________

I hear Li Yuan wants to be a cosmonette(女宇航员) like Liu Yang. It’s difficult for her.—But I think she can ______ her goal after work hard.