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. The Himalayan mountains are believed _______ about 50 million years ago.

A. to have been formed

B. that were formed

C. forming

D. to form

Robots at home will help people __________ household chores.

A. at

B. with

C. for

The sandwiches ___________ my aunt make are delicious.

A. that

B. where

C. who

D. whose

The museum ________ by many tourists every year.
A. visits
B. is visited
C. has  been visited
D. was visisted