The girl ______ the toy carefully and was sure it was not the one she had lost.

________is no need for you to come if you don’t want to[ ]

How come Tom picked a quarrel with his wife—________ We also have the occasional argument.

Air pollution is getting more and more serious，so we must take action________it is too late.

What a great weight she felt _____ off her mind the moment she heard she had been admitted to a key university.