根據語境選擇方框內恰當的詞替換劃橫線的詞

exceptional boost crisis shift substantial get involved in consisting of

（1）Without a major improvement in tourism，the economy will suffer even further.

boost

boost

（2）When you participate in sports and athletes，a lot of the racial barriers are broken down.

get involved in

get involved in

（3）The feet are highly specialised structures made up of 26 small delicate bones.

consisting of

consisting of

（4）This progress has greatly improved the prospects for growth and for a significant reduction in poverty over the next decade.

substantial

substantial

（5）At the age of five he showed outstanding talent as a musician.

exceptional

exceptional

（6）This accident caused a dramatic change in public opinion.

shift

shift

（7）She has always been to the fore at moments of danger.

crisis

crisis