The Space Age _____in October 1957 when the first artificial

D.commenced
.initiate是及物动词,用法是：…….initiates sth
originate是起源于的意思,不合适
embark和on或upon搭配才有开始的意思,而且embark on/upon后面需要有宾语.
commence有begin/start的意思,可以做及物动词,也可不及物动词
第二题是虚拟
条件句（既包含条件的句子）中如果见到might/would/could 等一般都是虚拟语气.既然主句是虚拟,条件状语从句中也要虚拟.但这里but引导的不是条件,而是事实,所以就不能虚拟了.所以选C.
汤姆本来可以及时赶上讲座的,但他起床晚了.
这句话等于；.Tom might have come to school in time for the lecture if he hadn't got up late.
（如果他没起晚,汤姆本可以赶上讲座）
意思一样,但后者就需要虚拟,因为后者的用了条件从句,而其这个条件是和事实相反的.

1、 in october 在10月份（泛指任意一年的10月）
2、 in the october of 2007 （特指在2007年的10月份）
3、 we have （a） dinner after the game 我们做完游戏后,一起吃了顿（晚）饭.
the表示特指某一事物,我们只是吃个饭,没有特指的意思.

是题目么?一定要将要么?
is可不可以啊?那就will begin

The Space Age _A（开始于）___in October 1957 when the first artificial satellite was launched by the former Soviet Union.
A.initiated B.originates C.embarked D.commenced
A bad cold ___B_（迫使）__ him to his bed last week.
A.restricted B．confined C.controlled D.restrained
In the early 1990s various measures were ＿_D（采取）__ to encourage savings,stimulate investment and motivate workers’ effort.
A.implemented B.imparted C.complimented D.exploited
I wouldn’t ＿to interfere.Instead,I let my students make their own decisions.
A.resume B.presume C.assume D.consume
Provided that my expenses＿C,I will go with you for the investigation next week.
A.are paid for B.will be paid
C.can be paid D.be paid for
If no one asks any question,I A（推断）＿ everybody understands．
A.deduce B.presume C.pretend D.presuppose
Cars are eating up too much space．They are packed on sidewalks and pedestrians have to___B（）_to these cars.
A.obey B．sacrifice C.attribute D.contribute
Every precaution must be made to keep all medications and dangerous substances out of a child’s __A_（out of one’s reach 让某人够不着 ）___.
A.reach B.approach C.range D.hand
I B＿looking at him with what must have been all but unbearable curiosity．
A.remind B.recall C.recognize D.realize
No one has ever＿B（责备）＿＿the senator of being at a loss for words; he can speak at a great
length on almost any subject.
A.accused B.blamed C.charged D.scolded
He ＿D（取消） his engagement just before the wedding.
A.broke out of B.broke away from C.broke off D.broke up
It B＿ on us rather suddenly that the number of passengers on the small spaceship we inhabit is doubling about every forty years.
A.dawned B．occurred C.drew D.struck
A newly developed robot that can show its emotions by smiling or frowning may one day help
computer users talk as quickly and easily to machine D（as …… as句型）＿ with other people.
A.such as they now talk B.like they now talk
C.as much as they now do D.as they now do
The police admitted D＿a mistake in arresting an innocent man.
A.to make B.to have made C.to having made D.to making
Protective measures have been adopted in most hospitals since too much C＿(暴露)to X-rays
can cause skin burns,cancer or other damage to the body．
A.disclosure B.exhibition C.exposition D.exposure
He was elected president of the Literary Research Association by A＿of his academic and organizational abilities.
A.virtue B.means C.way D.chance

When do you have an art festival?

on October 15.2003 对
有了具体的日子,介词用on

When is the English party
不明白的再问哟,请及时采纳,多谢 !