Neither he nor I was playing computer games at this time yesterday．We ______ trees in the neighborhood．（ ）
| A． |
were planting |
| B． |
planted |
| C． |
are planting |
Jane， I saw your mother yesterday．
It _________be her． She is working abroad．（ ）
| A． |
mustn't |
B． |
can't |
C． |
shouldn't |
D． |
couldn't |
_________she is very young， she can take good care of herself．（ ）
| A． |
If |
B． |
Unless |
C． |
Since |
D． |
Although |
Parents always _________us not to swim in the river in summer．（ ）
| A． |
promise |
B． |
train |
C． |
warn |
D． |
show |
Our Chinese teacher is so _________that each students likes her．（ ）
| A． |
patient |
B． |
lucky |
C． |
shy |
D． |
busy |
Don't use your mobile phone when you go _________the road． It's dangerous．（ ）
| A． |
through |
B． |
over |
C． |
into |
D． |
across |