题目内容

立磨细度跑粗主要原因有哪些?

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There are still many problems ______ before we are ready for a long stay on the moon.

A. solving
B. solved
C. being solved
D. to be solved

______ the past year as an exchange student in Hong Kong, Linda appears more mature than those of her age.

A. Spending
B. Spent
C. Having spent
D. To spend

I feel upset, for there are so many troublesome problems_______.

A. remaining to settle
B. remained to settle
C. remaining to be settled
D. remained to be settled

We are happy everything will go smoothly as _______.

A. to be planned
B. planned
C. being planned
D. having planned