It is possible. . . . .may assist some tree in saving water in the winter
a.the leaves are lost
b.when leaves have lost
c.that the loss of leaves
d.to lose leaves

 Is there anything here worth.......?
A.buy
B.to buy
C.buying
D.bought

Will you ……… me a favor?
A. make
B. do
C. give
D. call

What did you do this morning? – We …………the room white-washed.
A. had
B. have
C. got to
D. order

............... photosynthesis were to stop, life would disappear from the planet Earth relatively quickly.
A. For
B. However
C. If
D. Although

Experiments in the sonic imaging of moving objects ............... in both the United States and Europe well before the Second World War. 
A. were conducting
B. have been conducted
C. had been conducted
D. being conducted

 Physicians can look into the lungs, heart and other areas that were formerly ............... to them.
A. accessible
B. access
C. accessibly
D. inaccessible

 ( gạch chân dươi ch )
A. ache
B. chemist
C. cheerful
D. scholarship

( gạch chân dưới h )
A. hour
B. hear
C. hit
D. hat

 ( gạch chân dưới ou )
A. enough
B. rough
C. tough
D. though