Drugs are harmful to people's physical and mental health． We teenagers must_____them．（ ）
| A． |
take care of |
| B． |
keep away from |
| C． |
get used to |
， I found the job boring， but soon I got used to it．（ ）
| A． |
To start with |
B． |
First of all |
| C． |
Without doubt |
D． |
After all |
The land is rain because it hasn't rained for several months．（ ）
| A． |
known for |
B． |
useful to |
| C． |
harmful to |
D． |
thirsty for |
John didn't get the job he wanted． Let's go and ．（ ）
| A． |
turn him down |
B． |
call him back |
| C． |
cheer him up |
D． |
let him down |
You smoke at the oil station， it's too dangerous．
I'm sorry， I won't．（ ）
| A． |
couldn't |
B． |
needn't |
C． |
wouldn't |
D． |
mustn't |
Although our plane met with a storm， it landed ．（ ）
| A． |
safely |
B． |
suddenly |
C． |
secretly |
D． |
heavily |