________ astronauts go on spacewalks, they wear spacesuits to keep themselves safe.
| A． |
Though |
B． |
Till |
C． |
When |
D． |
Unless |
Arthur's memory starts to go wrong because of his age. So does_______.
| A．I | B．mine | C．me | D．myself |
There are a small number of people involved, possibly_______ ten
| A． as few as | B．as little as | C．as many as | D．as much as |
-- No one_______ be compared with Messi in playing football.
--- Oh, you are really his big fan.
| A．might | B．could | C．must | D．can |
--- The dish looked bad, but it_______ OK.
--- So it's not right to judge a man by his appearance.
| A． tastes | B．was tasting | C．was tasted | D．tasted |
-- I will buy you a new bike if you learn how to swim this summer.
-- Is that a _______? I'm sure I'll get the bike.
| A．chance | B．trick | C．promise | D．treat |