求大神做英语介词填空

求大神做英语介词填空
1.
The use of such techniques could result ——disastrous
ecological (生态的) changes.
2.
The attempt at efficiency and cost cutting
has resulted ——greater centralization; every penny to be spent must have his
approval.
3.
He didn't want an adult to take over, to
shield him——the
truth.
4.
These people were at a loss as to how to
deal with the dramatic economic change facing them as they had been completely
shielded——economic
problems.
5.
It is very simple to work ——the amount of calories (卡路里)
needed each day.
6.
Scientist may work——a new interpretation of that
phenomenon.
7.
The students in this college are all taking
courses leading——a
degree.
8.
Obviously it is very important to train
every pilot to recognize when his flying is leading——a disastrous crash, and to take
action in time to avoid it.
9.
I don't want to burden you——my problems.
10.
I was angry with your letter, and felt
burdened——too many
responsibilities.
11.
When you select an item for a program,
consider how it will contribute——your goal and how it could affect mood and outlook.
12.
The commission suggests that anyone over 18
who has contributed——the cost of the property he or she occupies should have to agree
to its sale.
13.
It could even vary——year to year.
14.
Efficiency could vary——doing the most basic task well
to decision making on complicated financial matters.
15.
In the rural areas, people could scrape——, thanks to what
they grew themselves, but, in the towns, the queues for food and fuel were
endless.