The subjunctive with verbs of doubt, disbelief and denial

Conjugate the verb in the present subjunctive according to the subject:

Dudo que ellos ___________ (trabajar).

Conjugate the verb in the present subjunctive according to the subject:

No es cierto que él ___________ (salir) mucho.

Conjugate the verb in the present subjunctive according to the subject:

No creo que el español ___________ (ser) difícil de aprender.

Conjugate the verb in the present subjunctive according to the subject:

Es imposible que nosotros ___________ (llegar) a tiempo.

Conjugate the verb in the present subjunctive according to the subject:

Es probable que ustedes ___________ (ganar).

Conjugate the verb in the present subjunctive according to the subject:

Es posible que mi madre ___________ (llamar).

Conjugate the verb in the present subjunctive according to the subject:

No es cierto que mis hermanos ___________ (ayudar) con los quehaceres de la casa.

Conjugate the verb in the present subjunctive according to the subject:

No creo que este gobierno ___________ (resolver) el problema de la contaminación.

Conjugate the verb in the present subjunctive according to the subject:

Es posible que los senadores ___________ (llegar) a cun acuerdo sobre la ley de ecología.

Conjugate the verb in the present subjunctive according to the subject:

No estoy seguro de que ___________ (haber) un centro de reciclaje por aquí.