My sister has trouble _____ English.
learn
learning
to learn
leared
考查固定搭配。根据 have trouble doing sth. 的固定搭配可知答案为选项B。
— Excuse me,but can you tell me where the nearest bank is?
— Just _____ going for two more blocks and you'll see it.
keep
to keep
keeping
keeps
本题考査祈使句的结构。
祈使句以动词原形开头，故选选项A。