_________ along the old Silk Road is an interesting and rewarding experience.
Travel
Traveling
Having traveled
Traveled
The outbreak of Covid﹣19 has meant an ______ change in our life and work.( )
absurd
abrupt
allergic
authentic
If I hadn't been faced with so many barriers,I ______ where I am.( )
won't be
wouldn't have been
wouldn't be
shouldn't have been
There will still be lots of challenges if we are to ______ garbage in a short time.( )
clarify
justify
satisfy
classify
Instead of getting down to a new task as I ______, he examined the previous work again.( )
had expected
have expected
would expect
expect
It is not a problem ______ we can win the battle;it's just a matter of time.( )
whether
why
when
where