can someone please check my answers thank you.

Question

1.)lenin founded the comintern as a way to
a. spread the revolution
b.take over the government
c.suppress soviet dissidents
d.improve soviet relations with other nations
i chose a
2.)isolationists in the united states believed that
a.the united states should have entered the war sooner than it did
b.the united states should proclaim economic sanctions against germany
c.europe's wars were of no concern to the united states
d.great britain needed help from the united states
i chose c
3.)great britain declared war after german troops marched in belgium because
a.it wanted belgium as an ally
b.germany might seize control of the english channel
c.germany was violating the 1839 guarantee
d.belgium did not have an army to defend itself
i chose c
4.)the boxer rebellion,the open door policy,and the treaty of portsmouth all
a.strengthened china
b.contributed to an increase in chinese trade
c.weakened china
d.helped to close china to foreign trade
i chose a
5.)one of the causes of the great depression was
a.rising wages and prices
b.falling wages and prices
c.very slow fluctuations in business activity
d. inconsistent growth in agricultural productions
i chose b